I've spent a lot of time thinking about this. I'm working on an open source AI project, and I use a kanban board for two things: items I know I'm likely to forget, and items I've completed already when I enter them. I get no value from writing down reminders to do the things I know I need to do, but having a short list of important reminders (eg reproduce and resolve an edge case bug) along with a list of accomplishments has been helpful and motivational