diff --git a/.reveal-md/styles.css b/.reveal-md/styles.css
new file mode 100644
index 0000000..daaa46c
--- /dev/null
+++ b/.reveal-md/styles.css
@@ -0,0 +1,3 @@
+.reveal pre code {
+  max-height: 80%;
+}
diff --git a/README.md b/README.md
index 07ba6da..17e3a5b 100644
--- a/README.md
+++ b/README.md
@@ -282,3 +282,12 @@
 ### URL Params
 
 [Pull request](https://github.com/nickovchinnikov/minesweeper/pull/50/files)
+
+
+## Redux intro
+
+### Pure functions benifits
+
+[slides](./slides/PureFunctions.md)
+
+[Pull request](https://github.com/nickovchinnikov/minesweeper/pull/51/files)
diff --git a/package-lock.json b/package-lock.json
index 670cf9e..0abde30 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,8 @@
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         "react": "^17.0.2",
         "react-dom": "^17.0.2",
-        "react-router-dom": "^5.3.0"
+        "react-router-dom": "^5.3.0",
+        "redux": "^4.1.1"
       },
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@@ -50,6 +51,7 @@
         "husky": "^7.0.2",
         "jest": "^27.2.3",
         "prettier": "^2.4.1",
+        "reveal-md": "^5.1.3",
         "style-loader": "^3.3.0",
         "typescript": "^4.4.3",
         "url-loader": "^4.1.1",
@@ -3367,6 +3369,15 @@
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       }
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+      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
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+      "dev": true,
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       "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.3.tgz",
@@ -10880,6 +10891,18 @@
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       }
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+      "dev": true,
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@@ -12586,6 +12609,13 @@
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@@ -13532,6 +13562,16 @@
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+      "dev": true,
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@@ -13728,6 +13768,48 @@
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@@ -14584,6 +14666,15 @@
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@@ -14789,6 +14880,23 @@
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@@ -15407,6 +15515,15 @@
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@@ -15644,6 +15761,18 @@
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@@ -15667,6 +15796,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
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@@ -15709,6 +15847,12 @@
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@@ -16569,6 +16731,23 @@
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@@ -16583,6 +16762,15 @@
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@@ -17326,6 +17514,39 @@
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@@ -17443,6 +17664,16 @@
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+      "optional": true,
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@@ -18503,6 +18734,30 @@
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+      "dependencies": {
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+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
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@@ -18612,6 +18867,40 @@
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@@ -18845,6 +19134,15 @@
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@@ -19180,6 +19478,12 @@
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+      }
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+      "resolved": "https://registry.npmjs.org/registry-url/-/registry-url-5.1.0.tgz",
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@@ -50694,6 +52315,15 @@
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       "dev": true
     },
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+      "resolved": "https://registry.npmjs.org/reveal-md/-/reveal-md-5.1.3.tgz",
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+      "requires": {
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+        "express": "4.17.1",
+        "fs-extra": "10.0.0",
+        "glob": "7.1.7",
+        "highlight.js": "10.7.2",
+        "livereload": "0.9.3",
+        "lodash": "4.17.21",
+        "mustache": "4.2.0",
+        "open": "8.2.1",
+        "puppeteer": "1.19.0",
+        "reveal.js": "4.1.3",
+        "serve-favicon": "2.5.0",
+        "try-require": "1.2.1",
+        "update-notifier": "5.1.0",
+        "yaml-front-matter": "4.1.1",
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+          "requires": {
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+          "dev": true,
+          "requires": {
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+          "dev": true,
+          "requires": {
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+          }
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+          "resolved": "https://registry.npmjs.org/open/-/open-8.2.1.tgz",
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+          "dev": true,
+          "requires": {
+            "define-lazy-prop": "^2.0.0",
+            "is-docker": "^2.1.1",
+            "is-wsl": "^2.2.0"
+          }
+        },
+        "universalify": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.0.tgz",
+          "integrity": "sha512-hAZsKq7Yy11Zu1DE0OzWjw7nnLZmJZYTDZZyEFHZdUhV8FkH5MCfoU1XMaxXovpyW5nq5scPqq0ZDP9Zyl04oQ==",
+          "dev": true
+        }
+      }
+    },
+    "reveal.js": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/reveal.js/-/reveal.js-4.1.3.tgz",
+      "integrity": "sha512-5VbL4nVDUedVKnOIIM3UQAIUlp+CvR/SrUkrN5GDoVfcWJAxH2oIh7PWyShy7+pE7tgkH2q+3e5EikGRpgE+oA==",
+      "dev": true
+    },
     "rfdc": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/rfdc/-/rfdc-1.3.0.tgz",
@@ -51143,6 +52857,23 @@
         "lru-cache": "^6.0.0"
       }
     },
+    "semver-diff": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/semver-diff/-/semver-diff-3.1.1.tgz",
+      "integrity": "sha512-GX0Ix/CJcHyB8c4ykpHGIAvLyOwOobtM/8d+TQkAd81/bEjgPHrfba41Vpesr7jX/t8Uh+R3EX9eAS5be+jQYg==",
+      "dev": true,
+      "requires": {
+        "semver": "^6.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
     "send": {
       "version": "0.17.1",
       "resolved": "https://registry.npmjs.org/send/-/send-0.17.1.tgz",
@@ -52416,6 +54147,12 @@
         }
       }
     },
+    "to-readable-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/to-readable-stream/-/to-readable-stream-1.0.0.tgz",
+      "integrity": "sha512-Iq25XBt6zD5npPhlLVXGFN3/gyR2/qODcKNNyTMd4vbm39HUaOiAM4PMq0eMVC/Tkxz+Zjdsc55g9yyz+Yq00Q==",
+      "dev": true
+    },
     "to-regex": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/to-regex/-/to-regex-3.0.2.tgz",
@@ -52565,6 +54302,12 @@
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       "dev": true
     },
+    "try-require": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/try-require/-/try-require-1.2.1.tgz",
+      "integrity": "sha1-NEiaLKwMCcHMEO2RugEVlNQzO+I=",
+      "dev": true
+    },
     "ts-dedent": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ts-dedent/-/ts-dedent-2.1.1.tgz",
@@ -52819,6 +54562,15 @@
         "imurmurhash": "^0.1.4"
       }
     },
+    "unique-string": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-2.0.0.tgz",
+      "integrity": "sha512-uNaeirEPvpZWSgzwsPGtU2zVSTrn/8L5q/IexZmH0eH6SA73CmAA5U4GwORTxQAZs95TAXLNqeLoPPNO5gZfWg==",
+      "dev": true,
+      "requires": {
+        "crypto-random-string": "^2.0.0"
+      }
+    },
     "unist-builder": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/unist-builder/-/unist-builder-2.0.3.tgz",
@@ -52962,6 +54714,73 @@
       "dev": true,
       "optional": true
     },
+    "update-notifier": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-5.1.0.tgz",
+      "integrity": "sha512-ItnICHbeMh9GqUy31hFPrD1kcuZ3rpxDZbf4KUDavXwS0bW5m7SLbDQpGX3UYr072cbrF5hFUs3r5tUsPwjfHw==",
+      "dev": true,
+      "requires": {
+        "boxen": "^5.0.0",
+        "chalk": "^4.1.0",
+        "configstore": "^5.0.1",
+        "has-yarn": "^2.1.0",
+        "import-lazy": "^2.1.0",
+        "is-ci": "^2.0.0",
+        "is-installed-globally": "^0.4.0",
+        "is-npm": "^5.0.0",
+        "is-yarn-global": "^0.3.0",
+        "latest-version": "^5.1.0",
+        "pupa": "^2.1.1",
+        "semver": "^7.3.4",
+        "semver-diff": "^3.1.1",
+        "xdg-basedir": "^4.0.0"
+      },
+      "dependencies": {
+        "boxen": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/boxen/-/boxen-5.1.2.tgz",
+          "integrity": "sha512-9gYgQKXx+1nP8mP7CzFyaUARhg7D3n1dF/FnErWmu9l6JvGpNUN278h0aSb+QjoiKSWG+iZ3uHrcqk0qrY9RQQ==",
+          "dev": true,
+          "requires": {
+            "ansi-align": "^3.0.0",
+            "camelcase": "^6.2.0",
+            "chalk": "^4.1.0",
+            "cli-boxes": "^2.2.1",
+            "string-width": "^4.2.2",
+            "type-fest": "^0.20.2",
+            "widest-line": "^3.1.0",
+            "wrap-ansi": "^7.0.0"
+          }
+        },
+        "camelcase": {
+          "version": "6.2.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.2.0.tgz",
+          "integrity": "sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==",
+          "dev": true
+        },
+        "ci-info": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
+          "integrity": "sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==",
+          "dev": true
+        },
+        "is-ci": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-2.0.0.tgz",
+          "integrity": "sha512-YfJT7rkpQB0updsdHLGWrvhBJfcfzNNawYDNIyQXJz0IViGf75O8EBPKSdvw2rF+LGCsX4FZ8tcr3b19LcZq4w==",
+          "dev": true,
+          "requires": {
+            "ci-info": "^2.0.0"
+          }
+        },
+        "type-fest": {
+          "version": "0.20.2",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
+          "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
+          "dev": true
+        }
+      }
+    },
     "uri-js": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
@@ -53041,6 +54860,15 @@
         "requires-port": "^1.0.0"
       }
     },
+    "url-parse-lax": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-3.0.0.tgz",
+      "integrity": "sha1-FrXK/Afb42dsGxmZF3gj1lA6yww=",
+      "dev": true,
+      "requires": {
+        "prepend-http": "^2.0.0"
+      }
+    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
@@ -53905,6 +55733,12 @@
       "dev": true,
       "requires": {}
     },
+    "xdg-basedir": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-4.0.0.tgz",
+      "integrity": "sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==",
+      "dev": true
+    },
     "xml-name-validator": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
@@ -53946,6 +55780,24 @@
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       "integrity": "sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg=="
     },
+    "yaml-front-matter": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/yaml-front-matter/-/yaml-front-matter-4.1.1.tgz",
+      "integrity": "sha512-ULGbghCLsN8Hs8vfExlqrJIe8Hl2TUjD7/zsIGMP8U+dgRXEsDXk4yydxeZJgdGiimP1XB7zhmhOB4/HyfqOyQ==",
+      "dev": true,
+      "requires": {
+        "commander": "^6.2.0",
+        "js-yaml": "^3.14.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "6.2.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-6.2.1.tgz",
+          "integrity": "sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==",
+          "dev": true
+        }
+      }
+    },
     "yargs": {
       "version": "16.2.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.0.tgz",
@@ -54028,6 +55880,17 @@
         }
       }
     },
+    "yauzl": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      }
+    },
     "yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index 75df29a..ee3476f 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,8 @@
     "storybook": "start-storybook -p 6006",
     "build-storybook": "build-storybook",
     "chromatic": "npx chromatic",
-    "prepare": "husky install"
+    "prepare": "husky install",
+    "slides": "reveal-md ./slides"
   },
   "repository": {
     "type": "git",
@@ -69,6 +70,7 @@
     "husky": "^7.0.2",
     "jest": "^27.2.3",
     "prettier": "^2.4.1",
+    "reveal-md": "^5.1.3",
     "style-loader": "^3.3.0",
     "typescript": "^4.4.3",
     "url-loader": "^4.1.1",
@@ -82,6 +84,7 @@
     "@emotion/styled": "^11.3.0",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
-    "react-router-dom": "^5.3.0"
+    "react-router-dom": "^5.3.0",
+    "redux": "^4.1.1"
   }
 }
diff --git a/reveal-md.json b/reveal-md.json
new file mode 100644
index 0000000..c1fa528
--- /dev/null
+++ b/reveal-md.json
@@ -0,0 +1,6 @@
+{
+  "separator": "<!--\\s*s\\s*-->",
+  "verticalSeparator": "<!--\\s*v\\s*-->",
+  "watch": true,
+  "css": ".reveal-md/styles.css"
+}
diff --git a/reveal.json b/reveal.json
new file mode 100644
index 0000000..807f024
--- /dev/null
+++ b/reveal.json
@@ -0,0 +1,7 @@
+{
+  "slideNumber": true,
+  "hash": true,
+  "history": true,
+  "backgroundTransition": "fade",
+  "width": "80%"
+}
diff --git a/slides/PureFunctions.md b/slides/PureFunctions.md
new file mode 100644
index 0000000..c4ebf24
--- /dev/null
+++ b/slides/PureFunctions.md
@@ -0,0 +1,139 @@
+---
+title: Pure Functions
+description: Pure Functions benifits
+---
+
+# Pure functions
+
+<!--v-->
+
+## Pure vs Impure
+
+```js
+const xs = [1,2,3,4,5];
+
+// pure
+xs.slice(0,3); // [1,2,3]
+
+xs.slice(0,3); // [1,2,3]
+
+xs.slice(0,3); // [1,2,3]
+
+// impure
+xs.splice(0,3); // [1,2,3]
+
+xs.splice(0,3); // [4,5]
+
+xs.splice(0,3); // []
+```
+
+<!--v-->
+
+## Pure vs Impure
+
+```js
+// impure
+let minimum = 21;
+const checkAge = age => age >= minimum;
+
+// pure
+const checkAge = (age) => {
+  const minimum = 21;
+  return age >= minimum;
+};
+```
+
+<!--v-->
+
+## Side-effects
+
+- changing the file system
+- inserting a record into a database
+- making an http call
+- mutations
+- printing to the screen / logging
+- obtaining user input
+- querying the DOM
+- accessing system state
+
+<!--v-->
+
+## Memoization
+
+```js
+const toLowerCase = {
+  A: 'a',
+  B: 'b',
+  C: 'c',
+  D: 'd',
+  E: 'e',
+  F: 'f',
+};
+toLowerCase['C']; // 'c'
+
+const isPrime = {
+  1: false,
+  2: true,
+  3: true,
+  4: false,
+  5: true,
+  6: false,
+};
+isPrime[3]; // true
+```
+
+<!--v-->
+
+## Memoization
+
+```js
+const squareNumber = memoize(x => x * x);
+
+squareNumber(4); // 16
+
+squareNumber(4); // 16, returns cache for input 4
+
+squareNumber(5); // 25
+
+squareNumber(5); // 25, returns cache for input 5
+```
+
+<!--v-->
+
+## Memoization
+
+```js
+const memoize = (f) => {
+  const cache = {};
+
+  return (...args) => {
+    const argStr = JSON.stringify(args);
+    cache[argStr] = cache[argStr] || f(...args);
+    return cache[argStr];
+  };
+};
+```
+
+<!--v-->
+
+## Portable / Self-documenting
+
+```js
+// impure
+const signUp = (attrs) => {
+  const user = saveUser(attrs);
+  welcomeUser(user);
+};
+
+// pure
+const signUp = (Db, Email, attrs) => () => {
+  const user = saveUser(Db, attrs);
+  welcomeUser(Email, user);
+};
+```
+
+<!--v-->
+
+## Functional Programming book
+
+[Mostly-adequate](https://mostly-adequate.gitbook.io/mostly-adequate-guide/ch03)