All of the tools, frameworks, libraries, and best practices built on top of them will be much easier to pick up and use, or create for yourself if you have a thorough understanding of the 3 languages the web uses.
I would recommend not getting distracted by learning frameworks or plugins right now. If you have knowledge about the foundation of how the web works, then you will be able to pick up new tools and frameworks with as much difficulty as you would putting on a shirt in the morning. And you may change your tools nearly just as often as you change your shirt, but HTML, CSS, and JS will always be constant ;)
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