Some are public, some are private. It is interesting at the university. Some are smaller than others. In college you have to study hard. That means no goofing around.
Professors are like teachers.
A university has many colleges that teach different things. You can learn a lot of things at a university. In art class you can discover how to make things with materials, like pigskin and live grass. In music you can learn to write songs. You can learn different languages and other things.