Learning guide: colours

The best way to learn colour is to paint from nature and study your favourite artist's use of colours. It takes practice. Colour theory is useful, but it can be confusing, especially because so many art teachers contradict each other. Should you use black or not? (My answer to that is yes, but you may prefer to paint more like the French impressionists who didn't use black to mix their paint.) What exactly are warmth and coldness when it comes to colours? Couldn't different artists perceive the same shade as cold, and warm, at the same time? How does colour create mood? What is a colour illusion? I am not going to tell you all the answers here. Instead I will tell you to practice, practice, experiment, make colour swatches and record what you have learned in your notebook.

If you don't understand Value, Light, and Shadow yet, you need to learn those first.
Dorian Iten is the best teacher for this topic, and he has a lot of free content:
https://www.youtube.com/@DorianIten

It may be helpful also to consider colour from a scientific point of view, studying how we perceive colour and colour illusions.

Goethe's Theory of Colour. Goethe was a famous German author, but he was also a scientist who studied colour.

https://www.youtube.com/watch?v=HtMvYHq2-uI

Colour perception and illusion
http://brainden.com/color-illusions.htm

A book on colour illusions

The Elements of Color
by Johannes Itten

James Gurney's channel
https://www.youtube.com/user/gurneyjourney

James Gurney's blog
https://gurneyjourney.blogspot.com/

Some fun videos.

The library of rare colours
https://www.youtube.com/watch?v=rApTzWboLrA

the pinkest pink https://www.youtube.com/watch?v=_NzVmtbPOrM