Learning MEAN Stack in a week is very difficult, especially if you have no experience with JavaScript, because MEAN stack is stack of technologies that are all built on top of JavaScript. Lean the individual technologies and start building small apps to see if you can build integrate these technologies together.
MEAN Stack is used to build the web applications both front-end and back-end. It is used to create a Web applications with all its components written in JavaScript.
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If you wish to lean MEAN Stack i would suggest you start by learning individual technologies of the stack like MongoDB, Angular etc.
You can also read this blog that explains what MEAN stack is.
If you wish to learn MongoDB you can do this end to end certification course on MongoDB.
Also you can learn Angular by doing this Angular course.
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