Hugo is a static site generator, but links to your site may contain optional
params like ref=... which may produce duplicate content for search engines.
You can use canonical URL to define, which URL should be used by Google and co.
Google has a very detailed description how to consolidate duplicate
URLs.
If you know Hugo and want just a copy a paste solution,
just add this to your head:
<head>
...
<link rel="canonical" href="{{ .Permalink }}">
...
</head>
This will result in an URL like:
<head>
<link rel="canonical" href="https://qameta.com/posts/your-blog-post/">
</head>
There is more you can do. See the full post here: https://qameta.com/posts/define-canonical-url-in-a-hugo-theme/
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