Docker is yet another tool used to help you manage your repositories helping them to be quickly setup on other machines without the hassle of setting up the environment to run the code in .
Go Ahead and Download Docker for you System : Docker Website
Also create your free account on DockerHub : Docker Website
For a quick analogy it is like Git and GitHub. Both of them are different but work together.
Basically DockerHub is a platform where we store our Containerized Images on a server just like on github we store our repos Below we have DockerDesktop and DockerHub
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Follow along folders in order ans they would be nested in each other
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Each folder will have a seaparate README to explain the contents.
Thank You