Ruy Lopez

What is the benifits & wekanesses it provides?

I just figured out that's my opening with white, typically.

And for black, what is it called when you open g7-g6 w/ pawn, and benefits/weaknesses

Just give it a bash in a few of your games or try it out in some blitz. I remember Andrew Martin once saying that you should play about 20-30 games of the opening then study it. Learn the 1st few moves then work the rest out for yourself. You'll get to grips with some of the ideas then afterwords you can look into the main lines.