No app recommendation. Just how I do it.

I started with a single file. I kept notes sorted by category, idea, topic, and project.

Then I switched to a chronological order, still in one file. I found a note about why I chose that. I just posted it here

But as I kept taking notes, a single file was no longer practical. It got way too big. So I split it into one file per day. For example, 2025-12-14_SUN for today.

Hope this helps.