Undecided Question

Is it necessary to apply moisturizer and a primer before applying makeup?

I have oily/dry skin, i found a website with all these steps to follow before actually applying makeup….
http://www.beauty-advices0o0com/makeup-for-enlarged-pores-how-to-hide-enlarged-pores/

Now is all of this really necessary? Or will I be okay with just purchasing a good primer?