MEAN Stack development is very promising as a career in 2019 because the individual technologies associated with it (MongoDB, ExpressJS, Angular and NodeJS) are quite popular and are being actively developed. These technologies are all based on JavaScript which is one of the major selling points of MEAN Stack. If a developer is proficient in JavaScript then they can get started with MEAN Stack without any issues. These technologies are growing in popularity.
It's also quite easy to get started with individual technologies such as Angular, Mongo etc.
If you wish to learn MongoDB you can follow this tutorial.
If you are a visual learner you can learn by watching this YouTube video
You can also learn Angular by either following this tutorial or this video
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