How do i learn MEAN stack?

MEAN stack is fundamentally a gathering of JavaScript-based web advancement innovations that incorporates MongoDB, ExpressJS, AngularJS, and NodeJS. Following graph unmistakably clarifies how these innovations cooperate to build up a web application.

AngularJS being customer makes AJAX calls to ExpressJS returning reaction in JSON group. ExpressJS that is running on NodeJS Server further speak with MongoDB as tireless medium (a NoSQL database).