If you have suggestions for new sections, hit up the github issue tracker (also reachable from the repo linked to in the upper right). If you have questions about the material, there's currently no comment section while I'm doing the rewrite, but you can use the issue tracker for that as well. Once the rewrite is done, I'll add a general comment section back in, and maybe a more topical "select this section of text and hit the - 'question' button to ask a question about it" system. We'll see. + 'question' button to ask a question about it" system. We'll see.