Salah scored on debut against Watford today.
"As a person, as a man, even on the pitch you can see that I have a lot of experience now," he told Sky Sports.
"I played in Italy, I was in Switzerland, I came to England then I went back to Italy so it's a big change in my life.
"I think I have improved everything.
"I think now, compared to three or four years ago, I can defend more, I can play more tactically, I can finish better than I could before.
"I scored about 40 goals with Roma so that's quite good.
"I always like to improve myself."