I am taking an online Node.js and MongoDB's course from MongoDB. However, it seems expect you to have fundamental understanding of Node.js. Thus, some of the assignments were difficult to me, because I don't understand how Node.js and MongoDB connects to each other.
Our previous exercises could be finished by writing several MongoDB command lines. Then, suddenly one of the assignment expected us to get the result from writing and node.js file, which I stuck there for two days. It was out of my knowledge base, so I went to Stack Overflow and asked how to solve such question.
However, the people on Stack Overflow didn't know that I came from a background without knowing Node.js, so they didn't like to answer my question and downvote my question.
I felt upset, so I went to Amazon and search Books talk about MongoDB and Node.js. At the end, I read several chapters, it fixed my frustraction and confusion.