I want to learn painting after school. I don't know what to learn first. Ask experienced art students for some advice.

If you are just an amateur, you don't have to concentrate on sketching, but the most basic knowledge should be like the distinction between light and dark parts. If you like sketching, you can usually draw more sketches and add some simple colors. You can also use a pure straight line to represent the volume. You can read Yu Xiaodong's books. If you like design, you can read Jin's book. Reading more masterpieces in your spare time can improve your horizons. It's good for you to sketch alternately in all aspects, such as finding a type? I personally like sketching? I hope my answer can help you!