I tried the whole Second Brain/Zettelkasten/PKM thing, and it never clicked. The kinds of notes that have been most useful to me are far more prosaic.
Productivity
Reflections on a year without a to-be-read list
In which I recomment Cassy Lottman’s post about her “productivity stream” and briefly reflect on the term “productivity”
Thinking about the value of software that can help you forget things, instead of burdening you with them forever.
A brief look at the tools I use daily to help manage my life
Too many hobbies. Too many ideas for fun side projects. Having all of these ideas in my head about things I’d like to do starts to become a real weight.