Keep trying to understand, asking questions, trying stuff first hand and eventually it'll come! The "Hask anything" sticky in /r/haskell is a friendly & pseudonymous way to ask questions too.

One thing I've noticed working in Haskell: Everyone is an expert in different things. Very rarely do I meet a Haskeller whose knowledge or interests subsumes another. That's part of the fun. Everybody doesn't know some terms!