For learning about drawing, sketching & watercolor, there are some amazing videos & books out there! Teoh Yi Chie, sketch artist, covers a wide range of related subjects with great depth. I learned from one of his tutorials about the book, Making Colors Sing by Jeanne Dobie. With it I am exploring the nature of individual watercolor paints in terms of transparency to opaqueness & how to mix colors.
Anne-Laure & her site "Watercolor sketching" with demonstrations is wonderful. I learned about her through multi-talented Blog artist, La Table de Nana, who is also generous in sharing resources.
How the Internet has changed the nature of studying & learning! The educational systems of just a few decades ago were more limited. However, my university experiences without the Internet but with live people & campuses were also very rich. Being immersed in a culture of learning is invaluable. Learning how to learn.
What I wish is that universities in the US were free & equally available to all young people,
as they are in some countries. But that is another subject...