diff --git a/chapters/12_additional_resources.md b/chapters/12_additional_resources.md
index 7bfff09a..ad24dd91 100644
--- a/chapters/12_additional_resources.md
+++ b/chapters/12_additional_resources.md
@@ -13,12 +13,12 @@
* [Solana Bytes, by Solana Labs](https://www.youtube.com/watch?v=90BTugVYGqQ&list=PLilwLeBwGuK51Ji870apdb88dnBr1Xqhm&index=3)
-* [Solana Bootcamp Videos](https://www.youtube.com/watch?v=0P8JeL3TURU&list=PLilwLeBwGuK6NsYMPP_BlVkeQgff0NwvU)
-* [Build on Solana by risein](https://www.risein.com/courses/build-on-solana)
-* [freeCodeCamp: Solana Curriculum](https://github.com/freeCodeCamp/solana-curriculum)
-* [Solana Frontend Development Course](https://www.youtube.com/playlist?list=PLMZny7wGLM6w4t7pMGATxFTjjMduTsEiF)
-* [Create a Solana dApp from Scratch](https://lorisleiva.com/create-a-solana-dapp-from-scratch)
-
+* [Solana Bootcamp Videos (Youtube)](https://www.youtube.com/watch?v=0P8JeL3TURU&list=PLilwLeBwGuK6NsYMPP_BlVkeQgff0NwvU)
+* [Build on Solana by risein, by Risein](https://www.risein.com/courses/build-on-solana)
+* [freeCodeCamp: Solana Curriculum, by freeCodeCamp](https://github.com/freeCodeCamp/solana-curriculum)
+* [Solana Frontend Development Course (Youtube)](https://www.youtube.com/playlist?list=PLMZny7wGLM6w4t7pMGATxFTjjMduTsEiF)
+* [Create a Solana dApp from Scratch, by lorisleiva](https://lorisleiva.com/create-a-solana-dapp-from-scratch)
+* [Solana Handbook, by Ackee Blockchain Security](https://ackee.xyz/solana-handbook.pdf)
@@ -34,36 +34,8 @@
* [60 Days of Solana, by RareSkills](https://www.rareskills.io/solana-tutorial)
-
-
-
----
-
-### Technical Articles
-
-
-
-#### Low-level Theory
-
-
-
-* [The LLVM Compiler Infrastructure](https://llvm.org/)
-* [The Executable and Linkable Format (ELF)](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format)
-
-
-
-
-#### Sealevel
-
-* [Sealevel Parallel Runtime, by Solana Labs](https://medium.com/solana-labs/sealevel-parallel-processing-thousands-of-smart-contracts-d814b378192)
-
-
-
-
-
-
---
### Tools for Developers