I’m sure it’s been covered here somewhat but @michaelcade and friends over at Kasten have launched learning.kasten.io. With 3 labs to start. Each will get you a badge and possibly a KubeCon pass. While they aren’t super in depth definitely worth the time!
Yip, part of the early access group too. Fed back a few changes. I agree with Jim, doesn’t quite go deep enough to explain some of the commands, but it’s a good place to start and get a feel for the subject