I have an odd system.
I use a piece of printer paper folded hamburger style.
the top of the sheet is were i track "todo". The left my todo list and there right is my "contact so and so, or waiting for response" list.
the inside of the paper is were I put my "notes" from all phone conversations.
The back of the paper is were I track project info "like a hex color, or sub niche keyword idea.
Each morning I get a new sheet of paper out and copy all the info onto it. This allows me to start each day with an overview of what I need to work on. Basically it reminds me of all the tasts.
All old sheets get a date and are put into my filing cabinet, (mostly for the phone notes)
The best part of this system is that my paper sets in front of my keyboard, and is not on screen. I can't stand using computers to track my tasts. (odd I know.)