Most Helpful Girl
youtube tutorias, make up magazines and things like that.
Plus there is always trial and error.
For me I use to buy all types of lipsticks and none of them really stayed. Youtube (from Michelle Phan) helped me realize that you just need a lip liner and then lip gloss on top and that's how it stays. So that's how I do my lips.
I learned to tight line from michelle phan too.
Just saying, good luck