Really it's just a fancy way to render a text file, but since it's in emacs that means it has loads of ways to interact with the file. Here's an example layout with dummy data for how I usually organize my notes. Every week I make a new .org file then fill it out like this as the days go on. My favorite bonus is all of these headlines "fold", to make navigating around a huge file easier. And you can nest subtasks near infinitely if you end up doing huge project management with it.

Really the biggest drawback to this is: for phones, org file support kind of sucks. They are technically just text files, but I can think of only 1 app that renders the files nice like this on a phone.