I know how to use bestimmt inside a longer sentence, but I’ve heard it many times also as a short reply to a statement. z.B
A: “…” [casual statement]
B: “Bestimmt.”
At first, it seemed to me that it has the same meaning of stimmt or das stimmt (to agree) but I was not sure. Looking on the web I found that bestimmt have a slightly different usage, but I didn’t get it.