I'd also state that it's not always necessary to be super organized. Some people get by just fine living in a chaotic sea of notes. There's a reason that the stereotypical image of the professor involves a desk that looks like a tornado struck the office.
No snark, "I Use Obsidian": Open Obsidian, click daily note, type note(s) adding #tags as needed.
My own Obsidian vault is bottom-up. I assume I'm going to be in a hurry, or too lazy to organize. Instead I try to write wiki style with lots of [[Links]] to reference people/places/things, and the structure emerges from those links. This is the only approach that has stuck for me.
In my own system, JD + PARA + Templates + Automated filing works like a charm and saves me a ton of time.
I think the important ideas for me are to keep notes, keep notes in plain text for portability and easy searching, and to keep notes backed up.
If I ever find the "perfect" organization for my notes, I feel confident I can write some crazy shell script to move stuff into the right places and ask an LLM to add the right tags.
Until then, I've got a searchable history of my work for my coworkers and future me to enjoy.
Then it goes to hell within a month.