But if you don't canonicalize your URLs yourself, Google will try to automatically
Having duplicate content on your site is not a violation of our spam policies, but it can be a bad
user experience and search engines might waste crawling resources on URLs that you don't even care
about. If you're feeling adventurous, it's worth figuring out if you can
specify a canonical version
for your pages. But if you don't canonicalize your URLs yourself, Google will try to automatically
do it for you.