This simple idea changed my life:
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I derived mine directly from a comment [1] on a writer (as in book authors) oriented forum. That one comment is worth a full blown website on its own.
I don't need tags. Willing to come across patronizing and say you don't either (not for personal knowledge management). Pretty soon you need to sort tags, find tags, cluster related tags, create tags of tags and other goofy gunk (see tiddlywiki to scratch this itch)
I keep things organized under 10 topics (so far used just 7). All plain text files. At the moment it lives in simplenote [2] (thats how I found the link above as a demonstration of its utility). I found notational velocity [3] and its alter ego NValt [4] useful when I had a Mac. Did not look for alternatives on windows. I just email myself these days. Look in my comment history for some tip around how I use that.
All of this is good for digital stuff. But for the deep, analog stuff that really matters, nothing, nothing beats the utility of taking notes in a 1 subject college notebook with a Pilot G2 ( i use a .38). I use the right side only (trade off for using cheap books). First page is the index. Each page numbered. I just make clusters of related words on each page. The main topic is circled to draw attention (4-5 per page). Anything related to it gets words around it. Details, references, long thoughts, go on the backside. Stacks well. I take pictures of good stuff. Don't fret if I lose any books (not lost any permanently till now). Do explore this route and see where that leads you. (hey a collge notebook is $00.75 in staples last I checked. What have you got to lose ?)
[1]: https://forum.literatureandlatte.com/t/large-scale-info-mana...
[2]: https://app.simplenote.com/
[3]: https://notational.net/
[4]: https://brettterpstra.com/projects/nvalt/