Take brief notes after each chapter. Summarizing helps cement knowledge.

Rubber Duck Debugging: explain your code line by line to an inanimate object.

Use a pointer or your finger to guide your eyes. This can increase reading speed by 25%.

Use the Feynman Technique: teach what you learn to someone else to identify knowledge gaps.

Organize books by color for visual appeal or by genre for practical access.

Write documentation as if the next person reading it is a violent psychopath who knows where you live.