I was wondering if the AP flour can be replaced in whole or in part with whole grain flour? If so, how much more water should be added to the recipe?

i got this when i googled the question:

To substitute whole wheat flour for white flour, use 3/4 cup of whole wheat flour for every 1 cup of white flour that your recipe calls for. Also, add 2 teaspoons of liquid, like water or milk, for every 1 cup of whole wheat flour you use so your recipe doesn't turn out too dry.