with a few characteristics/facts of people that I meet who I think could be consequential or I will see them again - so that when I see them again, I can use their name right away.
I also do what s0phleb0 does upon first meeting!
I never remember every recommended book, movie, website or idea that people share with me so I find it pretty useful to keep tabs so I can take the time to look up whatever I typed in notes
