I keep two notebooks: an A5 one for TODOs that has a specific structure, and an A4 one for whatever, that has no real structure, though I do tend to fairly reli

I keep two notebooks: an A5 one for TODOs that has a specific structure, and an A4 one for whatever, that has no real structure, though I do tend to fairly reliably fill them page by page from front to back. (Both cheapish, nothing fancy - always spiral bound though.) I've found this helps avoid any hesitation when wanting to note something down. I just reach for the larger notebook, find some space somewhere, and write.