Water Color and brush pen

I buy art supplies often and now I’m attempting to learn the tools. I know just a few simple tools can make great work, but I also like to try stuff out. Right now I’m working on learning this brush pen and these water colors. Limiting my palate with colors has me focus more on light and shadows, how I can blend to get more range. The brush pen is all about flow, and seeing what I can accomplish with just one tool. I just try to keep it all in my bag, so I can work on it regularly.