I really like to use different tutorials, and especially videos on YouTube. I have found a lot of different tutorials online and also decided to participate in makeup course https://thebeautylib.com/makeup-artist/ where are a lot of different information and special videos, helping to improve your skills and to learn more about how to apply professional makeup.
Apply your foundation before concealer.
Maintain your eyebrows with a spoolie brush.
Exfoliate your lips before applying lipstick.
Don't sleep on blush.
Melt your pencil liner to help it glide.
Make your eyeshadow pop with white eyeliner.
Outline your cat eye.