It's been around for quite some time and is not internally coherent, but it is optimized for search.
I always have Title and formatted date (2020-04-04) and then some text for the note. I make effort to include keywords as part of my notes, not formal hashtags. Sometimes I just add new notes to the end, sometimes I make the effort to put a new note in the middle of the file next to related note. Bit of a mess, but works with search.
2) Fleeting notes:
Whatever. If it's good enough (maybe 5-10% of these notes) I'll make the effort to copy it to permanent storage from slips of paper, email, simplenote etc. Most of the time, second glance on the fleeting note reveals it is not worth it and the note can be tossed (rewarding!). They are important, though, because you need the second glance to know.
I used to stress text files not being "mobile friendly". These days I prefer not to make permanent notes on mobile. But you can view them easily, they're just text.
As for local multimedia, I just mention in the text file that I have an image or video stored somewhere. If I need it, I can find it. Too much hassle making permanent filesystem URL:s or anything like that.
Max gain with minimum effort. Plus, I LOVE tossing useless fleeting notes.
I always have Title and formatted date (2020-04-04) and then some text for the note. I make effort to include keywords as part of my notes, not formal hashtags. Sometimes I just add new notes to the end, sometimes I make the effort to put a new note in the middle of the file next to related note. Bit of a mess, but works with search.