It seems like these days you can learn just about anything online for free, but of course some of that information is better than others. The good news is there are plenty of reputable places to educate yourself online for free, and here's a good 20 of them to get you started.
A flipped class keeps student learning at the center of teaching. Like the best classes have always done, this approach supports instructors playing their most important role of guiding their students to deeper thinking and higher levels of application.