What is the rel=canonical tag?

This blog is hosted in a bunch of places:

I prefer https://jameshfisher.com. The others are old, or insecure, or implementation details. To tell Google and everyone else which version you prefer, you can use the <meta rel="canonical" tag. On every page you serve, you put a <link rel="canonical" href="..."/> element, and this tells the client where the canonical location of that page is. Like so for the page /foo/bar:

<!doctype html>
    <link rel="canonical" href="https://jameshfisher.com/foo/bar"/>
  <!-- ... -->
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đź‘‹ I'm Jim, a full-stack product engineer. Want to build an amazing product and a profitable business? Read more about me or Get in touch!

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