Powder Brush: It's used for applying loose or pressed powder after foundation or alone! The powder brush is essential becuase it creates a flawless HD look!
Foundation Brush: It's used for applying liquid foundation! The foundation brush is essential because it doesn't absorb all of the product and leaves your face looking smooth!(Best in synthetic hair if not an HD Airbrush brush)
Concealer Brush: It's used for applying concealer ,eye primer or cream shadow! The concealer brush is essential because it also doesn't absorb the product and can hit the smaller imperfections!(Best in Synthetic hair)
Angled Blush Brush: It's used for applying blush and also contouring those places you don't want the light to hit!
Crease Brush: It's used for blending out those harsh lines with eyeshadow! This brush essential if you want to have a smooth fabulous eyelook!
All over shadow brush: It's used for shadow all over the lid!
These are just a few of the basic brushes you need to have a flawless application! FYI Synthetic brushes are great for cream shadows, foundations, and concealer! NATURAL BRISTLES hold pigment longer so it's best for powders!
Brushes are expensive but honestly you can find a great brand at target called Sonia Kashuk and her brushes are awesome great for shadows! Sephora(Platinum line) , MAC, SIGMA, Japonesque, STILA, Smashbox and Laura Mercier all have AWESOME brushes!!! I hope this was helpful! Let me know if you have questions!