I keep a record of any info that I learn (organized by topic) in Workflowy. I even keep a note of everything I do.

Basically my goal is to decrease the chance of going through the same process of learning something, multiple times.

I also think of it as a cache for Google. I sometimes search my knowledge base before searching Google.

For example: how to delete duplicate lines in emacs? I just found it in my knowledge base in under 3 seconds but would have taken more time googling (also more distracting)