There is a high rate of change in fads, not in reality. What is actually worth learning and following has a normal change rate. Fads are governed by a vast community of hipsters who clearly prefer to spend time and effort on earning 15 minutes of celebrity with some library or tool than on more productive tasks like improving their own web site, working for customers or learning principled computer science and software engineering. Meanwhile, web standards like HTML, CSS and ECMAScript and web browsers evolve at a reasonable pace and in a saner way: doing more things and doing the same things in a nicer way. The traditional design attitude of figuring out how web standards and imposed technology allow to do what is needed and only then selecting tools and libraries that look useful is the main way to ignore fads.