TITLE: Free intro to Linux commandline/server course starts first Monday of next month
This course has been running successfully now every month since February 2020 - more detail at: https://LinuxUpskillChallenge.org - daily lessons appear in the sub-reddit r/linuxupskillchallenge - which is also used for support/discussion.
Suitable whatever your background, and aims to provide that "base layer" of traditional Linux skills in a fun interactive way.