Home is a tough one, Tufguy. It often stands alone with no room for a preposition, as in I walked home. At other times, a preposition is optional, though it may change the meaning slightly: I wasn't [at] home.
You may also see another use of home, where it's a short version of "home base", the first of the four bases on a baseball diamond. Some baseball-derived idioms have become so universal that they've been adopted into British English.