This is why I have a large notebook full of odd notes. I am constantly scribbling, scratching out, and re-writing notes. I’ve got arrows indicating the sequence of events, lists that help me understand terms that I looked up, and translations for the characters that happen to be from a different country.
My notebook is an indispensable tool for me while I do my writing. It helps me keep my novels free of discrepancies or continuity errors, and it ensures that I remember important plot points.
I keep a notebook for my ‘real’ life, as well. It has my list of things ‘to do’ and the list of things I must remember.