Got a free pc. What do I got here.

I was given this pc for free. I don’t know much about pc tech. Not sure what I’m working with here. Hopefully these pictures show enough. Just wanted some insight on what I got here. What type of games can it play. And can I even upgrade this at all?

And yes I know it’s dusty as hell lol. This how it was given to me. I will try my best to clean it when I hook it all up.