I don't use some of them nearly enough, but I really like Zim Wiki on desktop/laptop for the ability to link to different files in my notes. For on the go, I tend to use Joplin right now as I like that it's open source & relatively easy to sync between my PC & phone.
I've dabbled a little with TiddlyWiki, but I feel like I need to learn more to really customize it more to my tastes. I've also been meaning to try running DokuWiki from a flash drive, as I like the wiki format a lot, but I feel like it may be a bit overkill.
I've seen some mention of Evernote & Obsidian here, but I've not used those personally. Also sorry if personal wikis are out of scope for this community, they're just among the first to come to mind when I read the name & sidebar!
I wanted to learn TiddlyWiki but I wanted to be able to edit from my iOS device. As far as I remember, I needed an app to do that, one that wasn't officially supported. So I went to Obsidian instead. I appreciate that it stores notes on your device so you are not locked in in case anything happens. And that I have an officially supported iOS app.