Of course, if you can restrain yourself, the best place can be your dormitory. Other secluded places are: library or study room, playground, canteen or dining room (on the dining table).
The relaxed teaching environment and abundant time in universities provide conditions for self-study, while the library resources and open academic environment in universities provide convenience for self-study.
There are many public classrooms in universities. Public classrooms are the best places for self-study when there are no classes, followed by libraries, reading rooms, lawns, gardens, a corner of the playground and so on. They are all classrooms for students to learn knowledge.
A few years ago, due to the expansion of university enrollment, the number of students on campus surged, which made the classroom occupy seats, that is, books were put on the seats and desks in advance, and notes were posted to show that the seats had been "reserved" by themselves.