If you're a front-end developer, it shouldn't take long to research the differences between modern front end frameworks. If you don't have any existing front-end skills, you won't have the ability to know what to dive into. True beginners need a solid foundation to build on, but once you have that foundation you should be able to adapt it to new and changing technology very easily. Once you have the foundation, you can dive as deep as you need into specific specialties and jump back out quite easily.

Learning your first programming language is hard. There's a lot of details and idiosyncrasies. The second is a bit easier because you have a base of experience to reference it against. By the time you're picking up your sixth language or front end framework or node API framework, you should be able to much more quickly assimilate the details because you've got so much more experience to draw on.