I'm going through the on-demand for session 1 right now.
Bit of feedback: I'm not a fan that, for logging on Linux, the demo was done with Syslog and /var/log. That's a rather outdated way of working as most modern Linuxen use Journald for their logs. At least the big brand names which students will encounter in the enterprise do so.
I also didn't like that in the JSON vs YAML discussion, it was framed as "JSON is for data, YAML for commands". That's incorrect.
Both JSON, YAML as well as XML are formats for passing data, in the shape of key-value pairs, lists, dictionaries, etc. They all pass data. The fact that Docker uses a Dockerfile's data as build instructions does not make the YAML file "commands", just like Ansible playbooks aren't "commands".
Finally, in the on-demand recording, many times when Tyler's speaking about showing something on his screen, the recording shows the slides; not his screen. For example the Git-section, around the 88 minute mark.