One section contains the actions you will take on positive matters. Some will be urgent and some less so and yet they deserve routine attention; e.g. study Spanish.
The other section is a list of the actions you should not take. [Snacking will be a common one for many of us.]
A nice idea. I have used a single 3×5 card (which I call my “Today Card”) as my daily task driver for years. I also split it into two sections — the top with the 3 or 4 things I must do today and the bottom for notes/scratch. I don’t often have a lot of stuff that gets added to the bottom so maybe I’ll give this a try.