Begin with straight legs 1 foot away from your bench or wall
Slowly lower your bum towards the floor as if you were going to sit in a chair
Ideally lower yourself until the top of your thighs are parallel to the floor, if you cant go that low, go as far as possible and over time keep going slightly lower
Be careful not to let your knees go beyond your toes
Now slowly return to the starting position
Tips
Try to keep your back straight at all times
To protect your back it is very important to use correct technique