MEAN STACK Development Oppertunities

I am looking to further my knowledge of the MEAN Stack. By profession I am an IT Recruiter that actually has a passion for Technology.

From what I hear MEAN Stack is on the cutting edge of development Stacks.

I'd really like the opportunity to get some opinions on each of the items in the stack.

Mongo DB what are some applications uses and what are the advantages and disadvantages between Mongo vs SQL and my SQL.

AngularJS seeing general knowledge of where this fits into the Web Dev world and what compares to it. Advantages and disadvantages between similar items.

EmberJS seeing general knowledge of where this fits into the Web Dev world and what compares to it. Advantages and disadvantages between similar items.

NodeJS seeing general knowledge of where this fits into the Web Dev world and what compares to it. Advantages and disadvantages between similar items.

Sorry for the cookie cutter on the last 3 but I am not a Developer again looking to improve my knowledge so that I can server the IT community here in Jacksonville, FL as a whole better.