If you wish to invest in some books, there are three, which I would highly recommend. This book goes through the basics of color and is very well organized. The discussions and exercises relate specifically to fabric and quilting. The Magical Effects of Color , Joen Wolfrom Joen's book is sophisticated and extensive in terms of color theory. The book goes beyond the basics and explains how to create sophistical visual effects with cloth.
Concepts are well illustrated with photographs of quilts.
Color , Paul Zelanski and Mary Pat Fisher Color theory and its application in many types of media are well described. This is an excellent reference book on color. If you wish to go back to the fundamentals, I would recommend Itten's Book, The Color Star . A larger reference list is in our book section . Practice - Construct a color wheel using paint or fabric or both Painted color wheel.