whats the best program to make flyers and brochure and business cards?

If you mean "the best" with no regard to cost, one of the Adobe apps is the best like InDesign or Illustrator. If you're trained on them. These are extremely powerful applications and can match the most demanding high-end printing requirements, if that is what you need.

If you have a limited budget or you don't need to match the highest design and production requirements, you can make flyers, brochures, and business cards just fine with apps like Apple Pages or Microsoft Word.