[KohKohPuffs]

I learned CAD through Google Hangouts. The classes consisted of following along the instructor in what he was doing through screenshare. However, out of everyone who participated, I was the only one who continued on to designing decent gearboxes, drivetrains, etc.

Looking back on that, I'll have to go with Arhowk partially. This is because I had one idea on teaching CAD, and that was using a method one my physics class used, which was called "flipped teaching": basically, all the learning happens at home while hands-on and practice activities happen in the classroom. So for CAD, perhaps you can have new members watch online lectures on whatever, and when they come to the robotics room they go hands-on with the CAD software. That way they can get help and feedback from whoever is instructing the class.

Not entirely an online course, but something that involves hands-on activity like the idea I just put out will be more effective in my opinion.