#1 – Optimizing content around one keyword.
#2 – Neglecting dated content.
#3 – Forgetting mobile users.
#4 – Not optimizing for site speed.
#5 – Failing to include relevant and helpful internal links.
#6 – Failing to include relevant and helpful external links.
#7 – Serving up hard-to-read blocks of content.
8. Forgetting about image optimization.
9. Not having unique content.
10. Focusing on quantity over quality.
11. Not optimizing URLs or site structure.
12. Neglecting broken or redirecting links.
13. Not auditing the redirect rules for a site.
14. Focusing on meta keywords.
15. Forgetting analytics or misusing metrics.
16. Not allowing your site to be crawled
17. Not taking advantage of Local SEO.
18. Incorporating too many PDFs.
19. Not optimizing for other search engines.
20. Not focusing on getting quality backlinks.
21. Having too many blog categories or tags.