I like to call my To-Do list my "Action List". It just sounds better to me, more encouraging to do something rather than just add items to a list.
I tried out a few programs but this one is easier and more useful. You can even change the background!
Here's the original background:
Here is a link:
The Best To-Do App for Windows
Using pen and paper is okay but you can't make changes as easily. Rearranging, organizing, deleting are much easier with a computer program.
But using paper and pen does not require any equipment or learning to use the software.
I still print a copy just in case something goes wrong.