These days I do everything in pen and paper. I file it in a file cabinet. I think this is what Fermi used to do, could be wrong. It works for me. No dependencies, no installations, no updates, no latency, pretty decent storage and great portability.
I make an effort not to dwell on productivity tools, which feel like spending time to save time in spurious and inconsistent amounts. Yes, I wish I could memorize and remember everything worth knowing and doing. No, sometimes it's nice to forget things and prioritize the information that's in front of me.