I already asked about the translation of the word "about", but I am still having a question which I also do not find the answer on the god "Google", but I really want to know what is the difference between "um", "von" and "über", those three sometimes can be used on the same case, but is there a difference or even a hint to understand the difference between those three ways. I know that "über" can be "on", I am talking about the translation in a sense of translation from the word from the German "about"
PS: I am sorry if this looks repetitive, tell me if yes