Using this "Bootstrap" app really speeds things up when building a website, but why don't teach the students how to do stuff instead of just delegating the dirty work to an outside css file? The pull-left and pull-right classes from lesson 3 are very basic stuff, just a float property. You could at least offer an option, to go on with or without Bootstrap, teach how using the class attribute from Bootstrap stylesheet aligns both ul elements, show which properties you can use to do it manually. Not a good course for those who want to learn about the CSS properties (which basically shape the entire webpage).
I disagree, you have the html + css course which teaches you the css property's (not all, but quit a few)
It is also good to know to learn how to use bootstrap.