This page is a draft and pretty much a work in progress. Expect things to change a lot.
A primary interest is something that takes up my free time for a while.
Suppose I've been playing a game for most of my free time. In that case, the game is my primary interest.
Of course I also do other things on my free time. I call these secondary interests. Things like reading books, writing software or other stuff. They can become primary interests at any time.
Each primary interest belongs to a broad category. For example, Entertainment, Personal Development, and System building are categories I used in the past.
A good way of figuring out the current primary interest is to ask myself: "If I had a lot of free time in hand, what would I be doing now?"
What is not a Primary Interest?