Mongo DB (the "M" in MEAN and MERN stack) is among the most dominant databases in use today.
Along with MySQL and PostgreSQL, Mongo DB an industry-standard database consideration among startups and large companies alike. But unlike the other two, Mongo DB is the de-facto standard for document based databases and has exploded in popularity since its release in 2009.
In this tutorial, Dan Kwon demonstrates how to implement a basic MongoDB project with Node.js & Express. He shows how to fully deploy the project.
You can watch the video on the freeCodeCamp.org YouTube channel (75 minute watch).