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It sounds like you need an installation guide. So, here you go: https://docs.docker.com/docker-for-mac/install/

I think that KhanAcademy offers a lot of great material on the basics of computer science, maths, and many more topics. It is also entirely and has a great user experience. (https://www.khanacademy.org/computing)

If you are searching for more advanced computer science topics, FreeCodeCamp and the FreeCodeCamp news platform might be for you (FreeCodeCamp offers programming content while the news platform has articles on a wide variety of topics, including computer science, productivity, math, etc.). (https://www.freecodecamp.org/news/)

Both follow a project and exercises based learning approach that first shows you the basics of the concept and then sends you out to build something and solve problems using the newly discovered skill.

This article will show you the basic concepts and features of WebRTC and guide you through building your own WebRTC video broadcast using Node.js.