I actively collect methods of information organization, so "which have I studied" is too broad to list in a comment.
Learning resources - the greatest learning resource is teaching yourself how to learn, and understanding how your personal learning system works.
When I go to learn something:
- I don't use just one source. I look at multiple sources, comparing different perspectives as part of the learning process. No one author will explain things in "just the right way" to make things click.
- I build a dynamic MECE (mutually exclusive, collectively exhaustive) "framework" as I learn a subject, which can organize every piece of information I might need to save. If a piece of information does not fit the framework, the framework is changed.
- I use image search to quickly find different perspectives of a particular concept.
Information organization recommendations: In general, I would start with "the basics" - a process - even if you're sure you understand it well. See if you can organize what you know into a MECE framework, and find out if your understanding of the information is "siloed" (based on a condition, such as context). Ask yourself how broadly you are able to apply your understanding, or pick an "unrelated" subject and organize it from a process view as an exercise. Look at different models of a process and which components are always included, and which are not.
What are some of the methods that you would recommended?