Excellent Docker presentation by Preethi Kasireddy

https://medium.freecodecamp.org/a-beginner-friendly-introduction-to-containers-vms-and-docker-79a9e3e119b

Where you learn:

- difference between a Container and a VM

- what is an Hypervisor (hosted or bare-metal)

- Docker Engine
- Docker client
- Docker daemon
- Dockerfile
- Docker image
- Union File Systems
- Volumes
- Containers

- Namespaces (NET, PID, MNT, UTS, IPC, USER)
- Cgroups (Control groups)
- Isolated union file systems