Videos in the course don't run. Tested with Firefox and Chrome. Please check
What OS are you using? Are there any firewalls that may block access? Can you provide Console log output to get more insight into the issue?
Videos are working on our end, and additional information is needed to try to replicate the behavior and troubleshoot.
Fedora 32 - tested with Chrome (no plugins) and Firefox (a couple of restrictive plugins):
I stopped the firewalld but nothing changed
E.g. at page https://trainingportal.linuxfoundation.org/learn/course/containers-for-developers-and-quality-assurance/introduction/course-information?page=6
it tries to connect to https://embedwistia-a.akamaihd.net/deliveries/4edc2d197f4cf0a6a820d9a8794575a9edfc642e.bin but can't
Just test it on my work laptop (windows 10) and it works. Maybe it is related with the codecs or some plugin?
Firefox console screenshot