Andrej Karpathy writes about his append-and-review note-taking system.

It’s super simple. No need for an expensive app. Just a simple note edited with any text editor or a default note taking app.

I like this approach. I would probably use it a system to add quick entries, and later triage or check off things. The harder we make it on ourselves to add quick notes (through complex systems), the likelier it is to miss adding altogether.