In Cyber Security or any learning, it is vital to keep good notes. This will help reduce skill fade. The first lessons of the course cover how to do this properly, and is something that's very important to pick up the habit.

The course recommends tools such as Cherry Tree, but I'm personally happy with using Notion.so for my notes, and if I need anything more in-depth I will look it up at that point - choose the rabbit holes you go down well.