Leg spin is a type of spin bowling in cricket. ... The leg spinner's normal delivery causes the ball to spin from right to left (from the bowler's perspective) when the ball bounces on the pitch. For a right-handed batsman, that is away from the leg side, and this is where it gets the name leg break.
Googly is a way of bowling (= throwing) the ball in cricket so that it spins in the opposite way to what the batsman is likely to expect. It indirectly means opposite to leg spin.
Off spin is a type of finger spin bowling in cricket. A bowler who uses this technique is called an off spinner. Off spinners are right-handed spin bowlers who use their fingers to spin the ball. Their normal delivery is an off break, which spins from left to right (from the bowler's perspective) when the ball bounces on the pitch. For a right-handed batsman, this is from his off side to the leg side (that is, towards the right-handed batsman, or away from a left-handed batsman). The ball breaks away from the off side, hence the name 'off break'.
