When playing rhythm guitar,do i try to keep my strumming in time with the drummers beat?

I am trying to learn how to play guitar.And i am having trouble figuring out strumming patterns.Thanks for all advice!

Usually the drummer and bass hold down the beat. Playing rythym is just keeping up with them. Although you can use some differing patterns. Playin on the upbeat or double timing, but you do have to stay with the main rythym of the song.