I'm an Android developer. The main content seems mostly useful for web/server developers, but seeing the instructor's realistic explanations and how happy they seemed while explaining made me think they're a genuine developer, so I completed the entire course. While it might not be immediately very helpful for mobile developers, these are fundamental things you should know, and they're useful content for collaborating with web/server developers. I especially liked how they provided many real-world examples from actual work. It's not too long, so you can easily binge-watch it in a day, which is great!