I have a (or multiple) paper notes on my table to my left, where I write down stuff. I often separate them into columns or paper notes of "today", "todo", etc.
At work, I have a text file with sections and bullet points (one-liners) for Critical today, Maybe/Opportunity today, and todos/backlog. That serves as a personal list and for "to check" or "small things to do" notes in addition to our task ticket system (with planning, descriptions, and assigning, etc; for Software Development).
More broadly, I'm okay with noting stuff down, and not really using it that much. It varies quite a lot whether I am able to tackle them or not (procrastinate/evade). But that's okay.
I also don't get a feeling of accomplishment when check-marking or striking through done items, which some other people seem to get. So it's more of a write stuff down for more structure and offloading from my mind, and to get a better overview.
"KILL"