Docker may be the best known implementation of containers today. Amongst the reasons why is that there is a free community version of it for nearly every platform that enables people to install and learn it for themselves. I first learned about Docker three years ago and started to study it by installing it in a Virtual Box VM running Ubuntu.
YOUTUBE kwsJIH5TGIg Docker 101
YOUTUBE eGz9DS-aIeY Here's a good intro. Network Chuck has a lot of…personality, but there's good info here.