Sure, the simplest method is a two‑column list: Task, Status. Write every task on a sticky or a notepad, then tick “Done” when finished. No formulas, no hidden cells. If you need a bit more structure, a basic Kanban board with three columns—To Do, Doing, Done—does the job without the spreadsheet headache. Keep everything on paper or a single text file, and update it twice a day at the same time. That’s all the precision you need, no more, no less.

Exactly, keep it tight, no fluff, just the essentials.