I really don't know anything about football, like what a linebacker is.
really, i do know, a linebaker is a playing position in American/Canadian football
I thought so! At least I know that haha.
yes, Linebackers are members of the defensive team, and line up approximately three to five yards (4 m) behind the line of scrimmage, 
Ohh that makes sense from where it got its name!
yes it is true,  Linebackers generally align themselves before the ball is snapped by standing upright in a "two-point stance"
That;s quite interesting, football seems more complicated than I thought.
yes it does, The goal of the linebacker is to provide either extra run protection or extra pass protection based on the particular defensive play being played at the moment