It may say A320 on the outside but Airbus have been building this for over twenty five years and constantly developing it. The key to understanding the bus is look at the system diagrams, in particular interaction with other systems. The aircraft is automated to the point that you cannot force it into the state that you want and you need to learn how to cope with the fbw degradations.
The FCOM and the flight crew trainng manual are ver good places to start.