your opponent can deviate from theory whenever they want, so learning tons of theory at a lower levels generally isn't a great idea. That being said, knowing three moves of the common main lines doesn't hurt. Most of my games at 1700 use around 7 book moves and then my opponent deviates
Openings (question)

Yeah, it depends on the player. Some people deviate really early, some know a lot of theory. I've played games where the first 20 moves are theory. And if a move isn't theory, it's usually worse, but at low levels it really makes no difference. Knowing a bit about the openings and a few lines doesn't hurt, though.
Yeah the openings I play generally don't have a ton of theory...

Yeah, it depends on the player. Some people deviate really early, some know a lot of theory. I've played games where the first 20 moves are theory. And if a move isn't theory, it's usually worse, but at low levels it really makes no difference. Knowing a bit about the openings and a few lines doesn't hurt, though.
Remember when you thought I was playing the piano against you
i knew it was different I just thought I could do the same thing
shaddup xD
Was this the game he beat you?
Aren’t openings theoretical? Every time I see a played out opening, everything has to work out right that your opponent does. Opinions?