What are your other essential tools you're using with Anki while expanding your knowledge.

I risk this post being slightly off topic but I hope it's not.

Many people here are fixed on learning new things, collecting knowledge and expanding their interests therefore I'm interested what other tools do you use next to Anki that consider essential. I'm mostly interested in basic stuff like how do you note your knowledge, where do you store it.

Reason I'm asking is because I've been jumping between google keep, notion, obsidian, google drive and can't seem to find simple and easy solution to store all my knowledge and have like a centralised hub for my notes, lists of usefull things, project notes etc.

What are your tools that you're using next to Anki and are somehow connected to your pursuit of knowledge?