For me the clearest example of the distinction of knowing something, even profoundly but not being able to practice it is writing with the "other hand" (with the left, if you're right-handed, etc). One absolutely knows how writing works, the shape of the letters -- it's the same "brain" ... but with the other hand, with the same knowledge, it doesn't work. Same with other similar things, playing a left-handed guitar: you know the shapes of chords, the sounds of scales, you can keep time. But the pick falls to the ground, the strings buzz, and you can't keep up.
TiddlyWiki is a great tool, incredibly flexible. I've seen it camouflaged as basically any other app out there (Roam clones, kanban boards, etc.).
The best (and meatiest) example I've ever seen of a (public) personal knowledge base is Soren Bjornstad's, https://zettelkasten.sorenbjornstad.com/ . He's the author of the -- in itself very impressive -- self-TW-hosted book https://groktiddlywiki.com/read/ He is also, in a way, a philosopher of the whole thing,