Theory then playing - need tips!

I don't know if its only me - but say I study a particular opening then I go to play some games I'm so focused on trying to remember the lines of the opening that if something not in the setup comes up everything falls apart and I usually lose the game. As a beginner is it worth studying one or two openings in depth or casually learning over as many as possible ?

its the theory behind the opening -- what can come of being in the squares you are in because of the opening -- that is important, not raw memorization without any idea why you are doing it. Take it from someone like me. I spent all this time memorizing 10 moves of all the most common openings and even some variations on the really popular ones, and then being down a piece in 12 or 13 moves, or losing in 20 moves cause I didn't really know WHY I was making the moves I was making. I since started sticking to just a couple openings and really trying to understand them, and then just making sensical moves when opponents deviate from the book lines or don't play the book lines at all. It's more important to make the best move available to you, instead of playing the next book move cause that is what the opening line says to do.