I am a bit disappointed with the course so far. The first chapter goes over find (and not very well at that) and then the first assignment expects you to figure out to use a command $in which was not discussed at all in the entire lecture.
For myself I have taken a course on mongo university about 4 years ago, (MongoDb for NodeJS Developers) and it was quite comprehensive. This course so far seems like they put no effort or thought into structuring the class in a way that is helpful for those people without experience. Quite disappointed so far.