Beginners - who cant juggle yet could try the 'drop kick catch' method as a way to start.
The aim : Slowly increase consistency so that each touch always goes back to the same spot (single perfect juggles) as this makes doing consecutive juggles much easier.
Beginners - an also try the following stepping stones
1. Let the ball bounce between touches
2. Use a balloon
3. Build up simple combinations: EG :
4. Sit down juggles using small combinations
5. Messi : Sit down Juggles