At the outset it's a good idea to learn some of the basic terminology and principles of colour-mixing and theory. Only the very basics can be covered here.
Some artists are definitely 'colourists' and develop a very fine sense of colour and how to use it.
If you lean in this direction then further study of this subject would be invaluable. The colour you perceive when you look closely at it - an object's true colour eg. These ' local colours' can appear quite different when viewed from a distance, eg. This is called 'atmospheric colour' . Local colour can also be affected by colours from surrounding objects which are reflected onto it, eg.