I make entries for each meeting, date, participant, notes, incoming and outgoing tasks. Also adding in sketches, designs, and other stuff that I wanted to write when I didn’t have a computer near.
I started this because I found having a laptop or phone out during a discussion with someone off putting. People would open up if I was jotting small notes but would not if I had a laptop open.
I can keep the notebook in my front pocket. Started out with hardcover moleskines but am not trying out rhodia, leuchtturm, and others.
Each one lasts about 3 months and I have a stack 4 feet high so probably 10 years or so.