The Ruy Lopez is a pretty sophisticated opening. The pressure that White gets doesn't lead to the quick, easy win of a pawn, but that pressure lasts well into the middle game. The Ruy is a pretty sophisticated opening, so it's not that easy for a less experienced player to understand what's going on. But the fact that it has been one of the favorite weapons for almost every great player should convince you that there may be more to it that meets your eye.
I'm in the beginners section for a reason...
The Ruy Lopez seems very popular, it's in all the videos I've watched, and after e4, e5, f3, c6 "standard" opening, is the most popular move, and the Engine puts it as the best move.
But why?
Intro to book openings video 1 says it attacks blacks pawn by putting pressure on its defender.
It then goes on to state however that if in fact white takes, white will end up down material.
You also have to spend another move coming back, and often yet another one, to move one piece 3 times (which seems to be against opening best practice), for an attack that if implemented doesn't work.
So, there has to be a reason, but I can't see it... yet!