I don’t think I really understood docker until I watched this video which takes you through building up a docker-like container system from scratch. It’s very understandable and easy to follow if you have a basic understanding of Linux operating systems. I recommend it to anyone I know working with docker:

youtu.be/8fi7uSYlOdc

Alternative Invidious link: yewtu.be/watch?v=8fi7uSYlOdc