This is pretty much the first part of any Javascript tutorial / book out there, so while it's obvious, I thought I'd include a quick post to say...
HTML is for structure, CSS is for style, and Javascript is for interactivity (or at least basic interactivity.)
Javascript can do cool things like perform calculations, dynamically swap images on a page, and validate data. (Yea, that's why it's worth learning. It's important in making a web page that isn't totally 10 years ago.)
You should know some HTML and CSS before jumping into Javascript.
If you don't know CSS yet, I recommend checking out the free tutorials over at w3schools.
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