In which applications to keep a list of completed tasks
There are no strict recommendations or a universally best method: you can also write on paper if it is more pleasant and convenient for you. Try different things and choose what you like best.
Notes
Actually, any notepad that you use regularly will do, as long as it russia number data supports bulleted lists or checklists (whichever is more comfortable and enjoyable for you). Ideally, it has the ability to pin a note to the top of the list so you don't have to look for it every time.
Planners
Although conceptually, lists of completed and planned tasks are opposites, technically they can be implemented in about the same way. Taking a to-do list as a basis can be convenient if you already use such a program, but decided to change the approach. Or if you plan to combine: for example, write plans for work tasks, and completed tasks - to track learning a foreign language.
that automatic deletion of completed items is disabled. Then, write down tasks and immediately mark them as done to get a dose of dopamine and move on.