Difference between concealer and foundation ?

So, I have a few questions.. : What's the difference between concealer and foundation ? What do you use (cos I need one that people would actually recommend) ? What's the price ? I get oily skin so I also need something that would make my face look smooth, and flawless. I don't have MEGA... show more So, I have a few questions.. :

What's the difference between concealer and foundation ?

What do you use (cos I need one that people would actually recommend) ?

What's the price ?

I get oily skin so I also need something that would make my face look smooth, and flawless. I don't have MEGA acne, just some around my chin. Other than that, my face is semi clear. I'm a freshman at highschool and I just wanna start something new. Plus, I need it to be cheap, I don't have tons of money, so please something under about $10.

P.s what routine would you recommend for me ?

Thank you xo
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