Are triangles bad for a mesh What impact would this have on say a game asset or something like a tank that's animated ?

Asking as I'm piecing together a project that will be involving my own models.

On occasions I've noticed when Bevelling edges the create Triangles on another face, so I wanted to be certain be accepting it.

Thank you
You can find a plethora of articles all over the place dealing with the subject. Like this one, or that one.

TL;DR:


  Use whatever works. Quads are the default. But feel free to use triangles when you need to use them. There’s no hard and fast reason to say that you should never use a triangle. Sometimes it’s just easier!