This lesson was about basic colour theory and how to apply it in Photoshop.
We learned about different colour schemes, like RGB and CMYK, colour depth, the colour wheel and hue/saturation.
We had to explore these in Photoshop, changing the channels and playing around with hue/saturation, and looking at different colour swatches such as Pantone.
I already knew most of these, so I haven't had any difficulties.