The edX course is a much shorter/condensed version of DO180. I would recomend doing DO180 after the edX course. There's also DO101: Introduction to OpenShift Applications
I'm trying to take this training but the course freezes up as soon as I start it. I am accessing it using Firefox 60.4.0esr (64-bit) on MAC OS Mojave 10.14.1. Anybody else having an issue?