Do you keep a commentarii / logbook / daybook etc?

What's your system for keeping a commentarii / logbook / daybook? Specifically something that lists without commentary what you do each day as short notes to aid with memory?

• Do you keep it as part of your regular reflective journal?

• How do you keep it concise while providing enough detail to help with memory?

• How do you format is physically on paper?

I've kept a commentarii/logbook digitally for years. I'm transitioning to physical paper now and think it's a good time to reflect on my current system and hoping for inspiration from others.