u/Fun_Belt2365

Hello! We’re going to Barcelona this week and I did google a lot about the public transportation but I still have some question. We’re going to stay in Sant Celonj and for that we’ll take the train.
Now, from what I understand the best option would be the T-Usual 4 because Sant Celoni is in zone 4 but we also want the be able to move in Barcelona with public transportation.
I don’t understand if I can also take the Renfe trains to Sant Celoni ori if we have any limitation regarding the public transportation, for example we want to take a metro or bus straight from the airport to Barcelona. Thank you