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diff --git a/‎apex/security/administration-services.md renamed to ‎apex/administration-services.md b/‎apex/security/administration-services.md renamed to ‎apex/administration-services.md
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diff --git a/‎apex/security/application-availability.md renamed to ‎apex/application-availability.md b/‎apex/security/application-availability.md renamed to ‎apex/application-availability.md
diff --git a/‎apex/tools/application-export.md renamed to ‎apex/application-export.md b/‎apex/tools/application-export.md renamed to ‎apex/application-export.md
diff --git a/‎apex/components/cards.md renamed to ‎apex/cards.md b/‎apex/components/cards.md renamed to ‎apex/cards.md
diff --git a/‎apex/components/lists.md renamed to ‎apex/lists.md b/‎apex/components/lists.md renamed to ‎apex/lists.md
diff --git a/‎apex/components/navigation-bar.md renamed to ‎apex/navigation-bar.md b/‎apex/components/navigation-bar.md renamed to ‎apex/navigation-bar.md
diff --git a/‎apex/components/navigation-menu.md renamed to ‎apex/navigation-menu.md b/‎apex/components/navigation-menu.md renamed to ‎apex/navigation-menu.md
diff --git a/‎apex/security/vulnerabilities.md renamed to ‎apex/vulnerabilities.md b/‎apex/security/vulnerabilities.md renamed to ‎apex/vulnerabilities.md
diff --git a/‎sqlcl/sqlcl.md renamed to ‎sqlcl/README.md b/‎sqlcl/sqlcl.md renamed to ‎sqlcl/README.md
@@ -4,19 +4,20 @@ Useful product documentation and scripts.
 
 ## Database
 
-### Infrastructure
+See the [`database`](./database/) folder.
 
-* [Container Engine](./database/container-engine.md).
+### SQlcl
 
-### PL/SQL
+* See the SQLcl [`README`](./sqlcl/README.md).
 
-* [Collections](./database/collections.md).
+## APEX
 
-### Utilities
+See the [`apex`](./apex/) folder.
 
-* [Logging](./database/logging.md).
+### Universal Theme
 
-## Developer tools
+The [Oracle APEX Universal Theme](https://apex.oracle.com/pls/apex/r/apex_pm/ut/getting-started) app provides documentation and examples of how to use its components.
 
-* [SQLcl](./sqlcl/sqlcl.md).
-* [APEX](./apex/apex.md).
+### `HR` sample schema
+
+The examples in this documentation use the `HR` [sample schema](https://docs.oracle.com/en/database/oracle/oracle-database/21/comsc/installing-sample-schemas.html) provided by Oracle.