Proofreading and adding to Lessons.
Proofreading and adding to Lessons.

Now that I haven't looked at them in a while, I've gone over the
Lessons. I fixed a few small grammar/spelling errors, and added to them
a bit.

mvz/hacketyhack,whymirror/hacketyhack,PragTob/hacketyhack,hacketyhack/hacketyhack