There are three ways to score a goal: (i) a dropped goal (scored in open play where the ball must hit the ground immediately before it is kicked); (ii) a penalty goal (awarded after the opposing side infringes against the laws of rugby and may be kicked from a stationary ground position or by drop kick); and (iii) a conversion (awarded after a try is scored) by either a drop kick or a place kick.
A penalty or dropped goal is worth 3 points; a conversion is worth 2 points.