The Brazilian signed for the Spanish giants in the January transfer window for a fee thought to be in the region of £142m.
Coutinho, who did not win a single trophy during his five years at Anfield, has made six appearances at his new club and has scored one goal.
"To play alongside so many great players is much better," Coutinho told Sport. "Each team has their way of playing and I am still learning how to play here, every day doing the best I possibly can."
When asked about the differences between Liverpool boss Jurgen Klopp and Barca leader Ernesto Valverde, the playmaker said: "Well, they are different. Each one has their own ways and their own experiences."
Coutinho will be cup-tied for the Champions League this season, meaning that he will be unavailable for selection when Barca take on Chelsea next week.