PARA is another concept from Tiago Forte’s Build a Second Brain that I like. It stands for the four main categories of information in our lives: Projects, Areas, Resources, and Archives. It’s a way to organize your notes and in my case, various to do lists. See also CODE. Roughly speaking:
Projects are the short-term efforts in your work or life that you’re working on now.
Areas are the long-term responsibilities you want to manage over time.
Resources are some topics or interests that may be useful in the future.
Archives include inactive items from the other three categories.