Do you have to go to college before going to the university?
You need to graduate from high school before going further. A
university will have a graduate school in addition to its
undergraduate programmes, while a college often offers nothing
above bachelor's degrees. No, you don't. Colleges and universities
are essentially similar. The main difference is the number of
terminal degree programs offered, with universities offering more.
If you have a high-school diploma, you can attend either. Some
schools even admit non-traditional students, older people who may
not possess a HS diploma or its equivalent.