Back during my Halcyon days when I was not half bad at chess my favorite opening with white was Pawn to King four. This is the old fashioned chess notation which is now known as e4. Now I learn the most popular opening is pawn to queen 4 (d4). Black’s usual response is d5 followed by white’s move to c4. This is what is known as the Queen’s Gambit. Black’s play is either Queen’s Gambit accepted or declined. Thought you would want to know.
Fun chess fact: In the 1927 match for the world championship between Alekhine and Capablanca the Queen’s Gambit declined was played 32 of the 34 games.