It’s easy to learn to build scalable interactive web sites if you choose a simple learning path. I recommend you start with Python and Django instead of JavaScript and Mongo, Express, Angular (or React, Vue) and Node (MEAN) stack.
I've observed the success and failure to approaches that thousands of developers took to access a REST-like API in the RICOH THETA developer community. I saw problems students encountered in workshops and one-on-one training. Novice backend developers finish more projects when they use Python. To get people started quickly, I developed a free video course on YouTube, The Beginner Django Tutorial.