Exclusively? I don't believe you can have a software development career working exclusively with PHP, JS, or RoR. That's far too limited a breadth of knowledge.

Exclusively? I don't believe you can have a software development career working exclusively with PHP, JS, or RoR. That's far too limited a breadth of knowledge. At best you might make some money on the side if that's all you know, but no company is going to hire you as a full-time professional developer based on just that. I wasn't saying that learning everything you need to learn for web development is as difficult as going through med school and becoming a surgeon. What I meant was that there are a ton of different technologies and specialties in web development, and you need to know what your specialty is before you can know what technologies you'll need. There are all kinds of different surgeons too, that specialize in particular organs. You can't just say "I want to be a surgeon, which organ should I learn" because it depends on what kind of surgeon you're going to be. Also, it wouldn't just be one organ because the body is a complex system of interrelated parts, and you need to know about all of that too if you want to be a good surgeon. Web development is like that too; you may specialize in PHP, JS, or RoR, but there are a lot of other related and intertwined technologies you're also going to need to know about.