at for a POINT in for an ENCLOSED SPACE on for a SURFACE at the corner in the garden on the wall at the bus stop in London on the ceiling Jane is waiting for you at the bus stop. Do you work in an office? The author's name is on the cover of the book.

I think it's best for English learners to keep a list of phrases with on, in and at. Eventually you'll get a sense for it, although there are instances where you can switch them up somewhat (which of couse makes it more confusing). "At" can be more general, "in" can been more specific. "He is at school, in an English class", for example. "In" can also sound more limiting sometimes (because it is more specific). "I can't go to the concert this afternoon, because I'm in school." Or "he's not going to be at the wedding, because he's in jail/prison." Compare with: pick him up at the jail, he just got released! "On" generally means "top of" or "functions" or "continuous". On top of the table. On top of the mountain. The computer is on. The tv/radio/stove is on. /// continuous = he just talks on and on and on; let's go on with the lesson where we left off yesterday