the difference UVs layout in coding

i want to create a quad . but. i find a difference solution , it’s confused me ,which one is the best solution to create UVs?
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The UVs say how the texture should be placed on the object. Depending where you put 00, 01, 10, and 11, the texture rotates. If you use (0,0.5) for some, you get only half the texture. That’s good for making a box with different sides.

Unity uses UVs the same way everyone else does. You can just look up UV mapping anywhere – like what (1,1) represents – and it will work the same in Unity.