Does anyone know where i can find a tutorial to learn how to develop a "bridge builder" game?
I only found commercial sites on Google.
That's a very specific game concept; I doubt you're going to find a tutorial so specific. More likely you should look into 2D game tutorials in general, assuming this is a 2D game. Can you elaborate on what kind of game you have in mind? If it involves the player building a bridge by snapping together pieces, and seeing if the bridge collapses, you'll presumably want a 2D physics engine like Box2D.