Is it true that just getting the basics right makes a difference in your makeup?

There is a huge difference between days when my makeup applies well and days when it doesn't.
Even when using the same base product, some days it cakes and other days it adheres perfectly.
People around me say that just getting the basics right makes a difference in your makeup, but the standard is vague.
I'm not even sure what it means to build a solid foundation.
I'm confused whether I need to pay attention to everything from toner to cream, or if I just need to take care of the essentials.
I'm also curious how much of the base I should let absorb before applying makeup.
I also want to know if skin that takes makeup well is something you are born with or something that is created through care.
I would like to hear your advice on what the most important point is at the basic stage.