1.e4 d5
With 1...d5, black immediately challenges the white center. White cannot successfully continue with 2.d4 because black would win a pawn with 2...dxe4.
But white has an excellent alternative. By simply capturing the black pawn with 2.exd5, black has an immediate problem. The only way to regain the pawn is with the queen (2...Qxd5), but we have learned that it is usuallky wrong to develop the queen early. That is certainly true here. After 1.e4 d5 2.exd5 Qxd5, white can develop a piece and attack the queen at the same time with 3.Nc3.
Black would then have to move the queen for a second time. White would then proceed to develop towards the center with moves such as d4, Nf3, and probably Be2 and 0-0.
Sources for further reading
J.Grefe and J.Silman, THE CENTER COUNTER, Chess Enterprises, 1983
A.Dunne and D.Taylor, CENTER COUNTER UPRISING, Thinkers Press, 1990