Honestly, whatever works for you.
My preferred system is two big directories, one for your daily notes (dailies, journal, etc), and another for literally everything else.
This is how logseq is implemented, and can easily setup emacs org-roam to do it too. It’s very nice because you don’t need to worry about where to put something, throw it in your daily journals and get all the info down there, and link densely. If it’s about a specific topic, link to it and when you go to that topic you’ll see the info in the back links below (logseq does it automatically, emacs take a bit of config). You can then transcribe the important/summary/etc info from all of your aggregated back links into a single well thought out and planned document, or at least a single trimmed down one. Or, just leave all the info in the back links, whatever works best for you
Biggest piece of advice, you don’t need to document everything you do in your life. If it’s info you might use in the future, a significant interaction or event, fun tidbit etc, add it in. If it’s just a casual conversation with someone that you don’t learn anything significant or it’s something that you’ll never link to or use again, just keep it as a memory.
I did a lot of over-capturing early on and got a lot of fatigue from it. Now my note making is as I run across things I’ll want to reference in the future (plans that were made, ideas to learn more about later, important phone calls/interactions, notes on articles, updates on projects, etc), with refinement to those ideas coming when I access them again later (or if I’m bored and have time). It’s no longer a drain to grow my PKM, it’s slower but much more meaningful info