Come by and talk to @animcogn or @mindjuju and get a login for the challenge you'd like to attempt
Blue-Team challenges are awarded points on completion. A VM is provided for you to use to go through the guide.
Red-Team challenges are awarded points on finding the flag
For a beginning intro to Docker, skim through
https://docs.docker.com/v17.09/get-started/
And go through https://training.play-with-docker.com/ until you feel like you have a good understanding of Docker
You will find flags for pwned machines at /flag.txt