How do you keep track all your games?

I kind lost track what games do i have when they hit 100, and I probably won’t notice any difference if some of them got revoked or removed from store now. Sometimes I got surprised to find out I have this or that game in my library and couldn’t recall when did I buy it. So a simple question I want to ask to those have over 1000 games, how do you keep track of all your games?