Whenever I want to simplify studies of softwares, I always use Google Slides as a scrapbook.
In Youtube and websites, I take screenshots of vital parts of tutorials and store them inside Google Slides. Onto them, I attach brief notes and links, and write offscreen comments. Screenshots act as memory triggers. Whenever I forget old tutorials, I always consult Google Slides.
In the left column, the thumbnails act as visual bookmarks. I push the most important tutorials at the very top, while pushing others downward the bottom.
Below is the example of a tutorial by Synfig that I found at Youtube. There, I simplified my studies of an object's wiggling action set by the parametres. Otherwise, I would not be able to remember this tutorial, if I hadn't used Google Slides as a scrapbook.
I have obsessively collected over 400 videos on Synfig Tutorials. None of them are mine. I regularly update my playlists, so I thought of sharing them here.
Synfig Tutorials and Demos #1 (nearly 300 videos)
www.youtube.com/playlist?list=…
Synfig Tutorials and Demos #2 (over 100 videos)