Sketchbook Skool provides online courses in drawing and watercolor painting from beginners to advanced artists. Website: https://sketchbookskool.com/courses/ Courses Include: Art Boot Camp Beginner Drawing Intermediate Drawing Advanced Drawing Watercolor - various levels

Web Exhibits Provides an overview of the history of pigments for artists and art historians. http://www.webexhibits.org/pigments/ This website is an example of many websites that contain pigment history and use guidance. Other sites are available. Search the categories for "artists pigments" to find other resources.