I took a few more that I didn't bookmark for some reason but it was fast enough to get through in a few nights. The gent teaching it was easy to understand, which is important to say because in 2008, youtube wasn't well populated. Now in 2015, anyone can write a tutorial and post it with some pretty graphics... that doesn't mean they are any good at teaching, speaking, organizing information, or speaking English. These things come in handy when you are in a hurry. If you are anything like me, I have no patience for digression, snails pace, vlog screens or virtual zombie games to teach me a language. Just give me the awk, sed, grep, ifconfig and make my life tick.
End of plug. :D