I just use Logseq and put double brackets around my key terms. Whenever I need to revisit a topic, I can quickly review what I've a already learned about it, when, and what else it was connected to.

My understanding is that Obsidian is pretty similar? The point of my PKM isn't to turn my notes into shipped things. The point of my PKM is that when I do want to work on something, I don't have to repeat all my old mistakes to get back to where I was before, or reinvent all my own wheels.