Will Kemp Art School has a lot of helpful tips for painting with acrylics (which are water based).
image via Will Kemp Art School
It is important to understand the difference between warm and cool colors, but more importantly you must understand how they can work together in your painting and when mixing colors.
This first video is about complementary colors, and how you can use a color’s complement to create different neutral tones (rather than adding black or white):
The second video (below) discusses color biases and how they affect your colors when mixing:
