I remember reading about it in an old Chessbase Magazine edition (circa 2010 I believe). They examined a game where White played
Bb5 at the right time, pinning the Knight then later exchanging it for weak queenside pawns, kinda like in the Ruy Lopez. I've used this idea fairly often, at least it's another option to
Bc4, the normal development move that might later run into
...Be6 in this case, and it's not like exchanging and playing on the queenside is forced then.
If Black also develops their
b4 also take space on the queenside, threatens
b5 to kick the
c6 Knight, and restrict both the Bishop and the Knight's activity.
In any case, there's nothing wrong with taking the center with
4.d4. As the
f1 Bishop might want to go to
b5 later, the first question to answer is how should the queenside be developed?
d4 and allows a
Qb3-Bc4 battery, but
Nc3 brings the Knight to a more active position (controls
d5 in particular) than
Nd2 where it would block the
c1 Bishop. Take back the pawn with
Bxf4 at some point (if
h4), and at this point, it should be clear where your light-squared Bishop can or should go.
At that point, White has completed development and has the center, whereas Black has trouble finding active play for his pieces. White should have a slight, lasting advantage, which should be converted in the long term. The rest is up to what themes you want to play around, but keep in mind the