I would consider looking at some youtube videos before asking about openings. It would be quicker and easier for you to do than wait for someone elses statement who doesn't understand it as well as a master. But I will admit, multiple ideas from different people can definitely help you understand what moves, not to play.
Here's a video about the Ruy Lopez with some explanation by an NM.
https://www.youtube.com/watch?v=_Bs7UtQR58Y
Also, this should go into the Chess Openings Forums.
Something I've been wondering especially since I've had a bad time usually playing aginst it is why is the Ruy Lopez so strong? What are some typical problems that Black faces (besides the double pawns in the exchange varation) or mistakes that Black has and makes?
I still know my biggest problem is my middle game especially looking at some GM Ruy Lopez games