Florian KOHLER advises and offers basics and principles for hitting the ball well in billiards:

• player's hand at the front on the cloth' table: the different bridges
• the position of the feet, body and head in relation to the pool table
• player's hand on the back: holding the cue and forearm

With an obvious sense of creativity, Venom - alias Florian Kohler - realizes the 3 cushions for the the entry point of French billiards in 20 different ways:

Here is a nice billiard video showing 100 training points at three cushions game.

The points covered and made are easy to put back on the pool table. This can allow, with a little practice and repetition, to progress to this difficult game.

This calculation system proposed by Olivier JACQUEMOND is childishly simple (just a division by 2) but extremely effective.

Once you have watched this video for a few minutes, the application on a pool table will be easy.