Very new to Raspberry Pi and don't know much about how it works but very interested and excited to learn how. Part of why I purchased one.
I have a Raspberry Pi 3 and have RetroPie installed (that I know how to do. Lol) However, I don't know how to get to Raspbian from RetroPie. I've seen others with multiple OS's on the same card and can switch between them. I've read about 'partitioning' and other language that is above me.
So again, my question is how do I get to Raspbian from RetroPie and vice versa?