Hi! There's a broken link at the end of the lesson notes https://prokolab.com/course-lesson/shading-light-and-form-basics/notes where it says " Check out the next lesson on how to Shade a Drawing!". Also the next lesson doesn't seem like it should be "how to shade a drawing", it should be "the basic elements - shape, value, color, edge" based on the lesson list. Another bug sorry: it's super laggy for me to type in this "Create a new topic" pop-up. It takes a few seconds for my words to appear as I type. I'm using Chrome Version 84.0.4147.105 on a Mac if that's helpful!