In this article we've listed over 90 of the most common SEO mistakes and how to fix them. If you have any comments or suggestions about this list of SEO mistakes – write in the comments, we'll discuss and add them.
- Broken Pages
- 4xx Error Pages: Client Error
- 5xx Error Pages: Server Error
- Links with Bad URL Format
- Duplicate Pages
- Duplicate Text
- Contains Lorem Ipsum
- Duplicate Titles
- Duplicate Descriptions
- Duplicate H1
- Missing or Empty Title
- Missing or Empty Description
- Broken Redirect
- Redirects with Bad URL Format
- Endless Redirect
- Max Redirections
- Redirect Blocked by Robots.txt
- Non-Compliant Canonical URL
- Canonical Chain
- Broken Images
- Links to Localhost
- PageRank: Dead End
- Missing Internal Links
- Bad AMP HTML Format
- Contains Flash
- Hreflang: Missing Self-Reference
- Hreflang: Incorrect Language Codes
- Hreflang: Relative Links
- Hreflang: Duplicate Language Codes
- Hreflang: Links to Non-Compliant URLs
- Hreflang: Missing Confirmation Links
- Hreflang: Inconsistent Language Code in Confirmation Links
- Long Server Response Time
- Missing or Empty H1
- Spelling Mistakes
- Min Content Size
- Images Without Alt Attributes
- Max Image Size
- 3xx Redirected Pages
- Redirect Chain
- Refresh Redirected
- External Redirect
- PageRank: Redirect
- HTTPS → HTTP Redirects
- Mixed Content
- HTTPS → HTTP Hyperlinks
- Multiple Titles
- Multiple Descriptions
- Same Title and Description
- Query Contains Question Mark
- URLs with UTM Parameters
- Compliant AMP Pages
- Blocked by Robots.txt
- Blocked by Meta Robots
- Blocked by X-Robots-Tag
- GA: Non-Compliant Pages with Traffic
- GA: Max Bounce Rate
- GSC: Non-Compliant Pages with Impressions
- Non-HTTPS Protocol
- Percent-Encoded URLs
- URLs with Wrong Hyphenation
- URLs with Unwanted Special Characters
- URLs with Uppercase Characters
- Same Title and H1
- Short Title
- Max Title Length
- Emojis or Special Characters in Title
- Short Description
- Max Description Length
- Emojis or Special Characters in Description
- Multiple H1
- Max H1 Length
- Max HTML Size
- Max Content Size
- Min Text/HTML Ratio
- Canonicalized Pages
- Identical Canonical URLs
- Canonical URL Contains Another Host
- Missing or Empty Robots.txt File
- Nofollowed by Meta Robots
- Nofollowed by X-Robots-Tag
- PageRank: Orphan
- PageRank: Missing Outgoing Links
- Hyperlinks with Empty Anchor Text
- Self-Referencing Hyperlinks
- Max Internal Links
- Max External Links
- Internal Nofollow Links
- External Nofollow Links
- Hreflang: Missing Alternate URLs
- Hreflang: Duplicate Alternate URLs
- Missing Structured Data
- Bad Base Tag Format
- Compliant URLs with Query
- Max URL Length
- GA: Compliant Pages w/o Traffic
- GSC: Compliant Pages w/o Impressions
- GSC: Compliant Pages w/o Clicks
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