I've been taking notes for more than 40-years. If you're learning, I'd suggest you write down everything - aperture, shutter speed, meter readings, Zone placement if you're using that system, subject, location, date, any observations about weather or light, then when developing write down the developer, time, temperature, fixer used, etc. All of this will greatly help you analyze what your doing and help you make mistakes into learning moments.

I still make these notes for large format - for roll film, i make a general note about the roll.

When I go back and print old negatives, the notes help me decide how to print, and help me remember just when and where the negative was exposed.
juan