[kettro]

To this end, I have a small, paper-sized whiteboard that I can scrawl onto on hands at all times. I bought a couple packs of the ultra-fine expo markers, and it’s been a boon. Great for quickly noting things down that don’t need to last.

Having both is important, though: you need to be able to preserve the things that matter, that you may need later on.

[Shorel]

You can use the rocketbook app. No need to buy the notebook.

https://getrocketbook.com/

[mark-r]

That's why phones have cameras.