Building up Colour
This is where you choose a colour and practise building up the shade and intensity and learn how to achieve the consistency and hue you require. You can start with the darkest shade down to the lightest or vice versa.
This is the same principal as the above but this time you build up different colours. As you do so you can see what new colours are created when the two are blended together and this will help you learn about colour mixing and how one colour affects another.