AWS EC2 Confusion

I understand very little about how and what EC2 is. I understand it is a virtual machine and i can do what I want with it, but I don't understand how. I usually use t.2 micro (a free version) but then what? I created it and it sits there. Maybe since it's free I can't do much with it? Like I see windows as an option so does that mean I can remote into a windows base desktop? again I'm using a free version so maybe that's why I'm a bit lost.