How did the artists of the blue rider group (for example, kandinsky) or the bridge group (such as kirchner) understand the function of color, line, and other elements of painting?.

Sorry about the calculator and me asap me asap because for real like some no one answers question one for me so that's why i'm posting them over to that way someone can at least answer number two or one for me if you do you so much if you do it would be a complete big blessing to me