Is it recommended to maintain texture resolution at a square power of two even if the mesh will never use the entire area?

Answer 1

Textures should always be a square power of two no matter what. (512 x 512, 1024 x 1024, 2048 x 2048, 4096 x 4096). Ideally the mesh should use the entire area but if it is impossible to use the entire space, keep your texture resolution square.