My daily notes:
- Exercises I made today, with a few details (how it was going, why maybe I failed, why maybe that exercise was so easy).
- What I ate today and what made it good / how can I improve.
- Money spent, what made it good / how can I improve.
- How did I spent my free time (developed something, worked on a side project, what did I do, what could I've made).
- Random thoughts and ideas.
Instead of just put info there without detail, I try to "explain to myself" a little bit, helping myself when I check them later.
Funny how it helped me a lot when I got bored. Well, if I have nothing to do, maybe I might just check my own notes to see what I wanted to do days ago.