Some people organize their work with to do lists, and some people use calendars. I know there are plenty other methods, but those are the two methods I’ve tried at any length. These days I am a list person. I use Todoist, and I have for years, but I don’t do a lot of categorization or really anything fancy. I pretty much organize my list of tasks either the night before or in the morning, taking a few minutes to figure out what things I need to do today, and what things I want to do today.