Meteor + Angular vs MEAN Stack?

Which combination/stack is better for web applications.

Can anyone please explain Event Driven nature of Node.js?

How does a web server work?

Friends I am beginner to server side language. I want to know how server works. Can anyone please send me some sources to learn it?

Are there any Backend end developers here learning Node.js?

Just want to learn the fundamentals.

I know how to code because in my degree I have learnt C++. But I didn't learn Database. Can I learn MongoDB without learning SQL?

What are some of the best sources for learning NodeJS?