I create a list every morning. I'm switching tools from time to time, but the system is the same (currently using Bear on macOS, but trying Joplin for cross platform, before that I used TaskPaper which is really a great tool because of how simple it is).

Try to list all the things I need to do across all my tasks and areas of responsibility, and check them throughout the day. If I didn't get around to something I copy it the following day to the next list. Simple stuff.