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TOP 90 most common mistakes in SEO and how to fix them

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2023-04-12 | Time to read: 3 minutes
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Author: Simagin Andrey

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.

  1. Broken Pages
  2. 4xx Error Pages: Client Error
  3. 5xx Error Pages: Server Error
  4. Links with Bad URL Format
  5. Duplicate Pages
  6. Duplicate Text
  7. Contains Lorem Ipsum
  8. Duplicate Titles
  9. Duplicate Descriptions
  10. Duplicate H1
  11. Missing or Empty Title
  12. Missing or Empty Description
  13. Broken Redirect
  14. Redirects with Bad URL Format
  15. Endless Redirect
  16. Max Redirections
  17. Redirect Blocked by Robots.txt
  18. Non-Compliant Canonical URL
  19. Canonical Chain
  20. Broken Images
  21. Links to Localhost
  22. PageRank: Dead End
  23. Missing Internal Links
  24. Bad AMP HTML Format
  25. Contains Flash
  26. Hreflang: Missing Self-Reference
  27. Hreflang: Incorrect Language Codes
  28. Hreflang: Relative Links
  29. Hreflang: Duplicate Language Codes
  30. Hreflang: Links to Non-Compliant URLs
  31. Hreflang: Missing Confirmation Links
  32. Hreflang: Inconsistent Language Code in Confirmation Links
  33. Long Server Response Time
  34. Missing or Empty H1
  35. Spelling Mistakes
  36. Min Content Size
  37. Images Without Alt Attributes
  38. Max Image Size
  39. 3xx Redirected Pages
  40. Redirect Chain
  41. Refresh Redirected
  42. External Redirect
  43. PageRank: Redirect
  44. HTTPS → HTTP Redirects
  45. Mixed Content
  46. HTTPS → HTTP Hyperlinks
  47. Multiple Titles
  48. Multiple Descriptions
  49. Same Title and Description
  50. Query Contains Question Mark
  51. URLs with UTM Parameters
  52. Compliant AMP Pages
  53. Blocked by Robots.txt
  54. Blocked by Meta Robots
  55. Blocked by X-Robots-Tag
  56. GA: Non-Compliant Pages with Traffic
  57. GA: Max Bounce Rate
  58. GSC: Non-Compliant Pages with Impressions
  59. Non-HTTPS Protocol
  60. Percent-Encoded URLs
  61. URLs with Wrong Hyphenation
  62. URLs with Unwanted Special Characters
  63. URLs with Uppercase Characters
  64. Same Title and H1
  65. Short Title
  66. Max Title Length
  67. Emojis or Special Characters in Title
  68. Short Description
  69. Max Description Length
  70. Emojis or Special Characters in Description
  71. Multiple H1
  72. Max H1 Length
  73. Max HTML Size
  74. Max Content Size
  75. Min Text/HTML Ratio
  76. Canonicalized Pages
  77. Identical Canonical URLs
  78. Canonical URL Contains Another Host
  79. Missing or Empty Robots.txt File
  80. Nofollowed by Meta Robots
  81. Nofollowed by X-Robots-Tag
  82. PageRank: Orphan
  83. PageRank: Missing Outgoing Links
  84. Hyperlinks with Empty Anchor Text
  85. Self-Referencing Hyperlinks
  86. Max Internal Links
  87. Max External Links
  88. Internal Nofollow Links
  89. External Nofollow Links
  90. Hreflang: Missing Alternate URLs
  91. Hreflang: Duplicate Alternate URLs
  92. Missing Structured Data
  93. Bad Base Tag Format
  94. Compliant URLs with Query
  95. Max URL Length
  96. GA: Compliant Pages w/o Traffic
  97. GSC: Compliant Pages w/o Impressions
  98. GSC: Compliant Pages w/o Clicks
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