What are the common SEO mistakes?

I have to personally do this mistakes for SEO. And I can find this mistakes after getting a more traffic in my site,
slow site speed, low quality images it's really slow down you traffic's. Don't use a duplicate content because google find it a scam quickly. In this three thinks are major mistakes.

There are few mistakes like duplicate content, broken images, outdated content, no optimization for mobile, broken links, page not indexed, improper length of meta tags, long messy URL.

Greek Austin said:

SEO mistakes?

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Not knowing your audience and not producing relatable content.
Poor SEO strategy.
Adding low-quality content and links to the site.
Overdoing the internal linking.
Bad page loading experience for the users and a non-mobile-friendly site.
Using wrong tools and technologies.