Many LG questions are "reincarnations" of past LGs, and you will see it once you foolproof all the games under PT1-35. If you memorize inferences, you will be able to make similar inferences in fresh games you haven't done.
Could you maybe tell us what question you are having difficulty making inferences? Have you fool-proofed all the games in PT1-35? As @tanes256 says, J.Y.'s explanation videos are great, so if you haven't seen them, you definitely should :)