The stance is the standing position of a batsman before a ball being bowled at him. Feet 40 cm apart, parallel to the crease, shoulder pointing down the wicket and head facing the bowler is described as an ideal stance. When the ball is about to be released, the batsman needs to lift his bat to play a stroke, after which he resumes into position to address the ball once again.
When the batsman lifts his bat in anticipation of hitting the ball, this action is known as the backlift. It's a common conception that the bat should be raised as vertically as possible but there are suggestions from coaching manuals that it's more accurate for the bat to be slightly angled.
Depending upon the course of the ball, the batsman usually moves forward or backwards in his attempt to obstruct the ball. A forward movement is usually a front foot shot while the backward movement is back foot. A front foot shot addresses the ball that arrives between the ankle and thigh height.
A back foot shot is used to address a ball arriving between the thigh and head height. The batsman usually steps back and maybe stands on his tiptoes to raise his bat to the height of the ball.
A leave is usually when a batsman doesn't physically play or interfere with the ball as it passes him. The bat is held well out of the way of the ball. Sometimes, batsmen utilize the leave during the first few balls in order to judge the bowling before attempting to play a shot. However, in case of leaving a delivery, it's important to watch the ball closely to ensure that it does not hit his wicket, his bat or even his hands. Accidental contact could lead to him getting caught out.
These are basic batting movements. There are however more complex techniques that include vertical bat shots, horizontal bat shots etc. The next article talks about these detailed batting techniques.