Memorisation is not at all important for learning to play chess. It won't make you better at the game. Training your pattern recognition, your positional/endgame/opening understanding will.
Until you're around 1500 real life ELO(which takes years for most people), all you have to do is play the game and enjoy it, analyse it with the opponent or other friends from the club. No memorisation required.
A lot of times, Memorization isn't even needed. People develop mental shortcuts for calculation in positional, endgame, and middle game sections.
Things like forcing doubled pawns on the C/F files (depending on your color), calculating whether you can promote before the king can catch up (that triangle strategy). Lucena and a few others.
With a solid opening repertoire that's chosen to force certain openings/sublines you can limit the study needed significantly (and shoot to the moon rating wise).
Point is memorisation is pointless. The way to study an opening is to understand the ideas, possible endgames, tactical and various structures that can arise.