A long time ago when I was in college, my professor noticed that I had trouble with compound verbs that take the dative, so he wrote on a slip of paper the following: ad, ante, con, in, inter, ob, post, prae, prō, sub, super, and sometimes circum and rē. Verbs compounded with these prefixes, where the meaning of the new verb changes significantly enough, take their object in the dative, rather than the accusative, case. This video explores this concept in greater detail.
91 rules of grammar cases nouns verbs