I spent a lot of time context switching (lots of roles, go-to guy for fixing things) so lists are a key tool in keeping me sane.

I've tried many things over the years but settled on Quip. The availability of the app on many platforms (mobile, desktop) means I can pretty much take notes anywhere (except the shower; I have pen and paper for that and transfer it to Quip later).

The shared notebook functionality allows me to easily organize my thoughts and share with others as necessary. This works for both short lists and longer documents. For example, I've built a fairly extensive document on HTTPS configs and best practices over time just by filling things in as I go along.

No relationship to Quip. Just a very happy user.