This isn't an ad, I'm not affiliated with the program.

I recently tried https://obsidian.md and found it really helped me overcome my laziness and take notes down. Another thing I have found that helps is to just make the note and deal with organization later. I started by making several unconnected notes, but they quickly grow into small graphs.

IMPORTANT WARNING: This is not FOSS and has a weird licensing model. You don't have to worry about this too much since it just makes markdown files which are easy to move between different note programs. If they do not open-source it, I am feeling fairly optimistic on making my own (if no one beats me to it, in which case I would just want to contribute to theirs).