What is the difference between the past tenses "imperfetto" and "passato prossimo"?

Both past tenses are highly used in verbal and written communication. Imperfetto is used when we are talking about a recurrent action in the past (i.e Da bambino andavo al mare tutte le domeniche = When I was a child I used to go to the beach every Sunday). On the other hand, passato prossimo is implied for non-recurrent past actions (i.e Da bambino una volta sono andato al mare = When I was a child I once went to the beach). Imperfetto is also used to describe lasting events in the past (i.e Ieri pioveva = Yesterday it was raining). On the contrary, passato prossimo describes temporary actions or events happened in a precise moment in the past (i.e Ieri ha piovuto un po’ = Yesterday it rained a little).