List of The Most Common SEO Mistakes

I have listed the most common seo or search engine optimization mistakes google organic search does not like. Look over this list of common seo mistakes and you may find that you have committed some of these seo errors and have not even been aware of the fact that you have done so.
• Doorway pages:
• Doorway domains / multiple domains with same content:
• Duplicate content:
• Cloaking:
• Excessive HTML markup:
• Creating search engine roadblocks:
• Having Flash-based site:
• Having text in images:
• Hidden text:
• Doorway pages:
• Doorway domains / multiple domains with same content:
• Duplicate content:
• Cloaking:
• Excessive HTML markup:
• Creating search engine roadblocks:
• Having Flash-based site:
• Having text in images:
• Having frame-based sites:
• Having most content behind login:
• Poor site inter-linking:
• Deep directory structure:
• Having less content / Non-original content:
• Using session IDs:
• No efforts in getting incoming links:
• Relying on one-time SEO:
• Showing impatience:
• 404 Errors
• No 301 redirects www and non www
• Adding dates to content
• Duplicate meta tags
• Links are not Relevant
• No Anchor text
• No Relevant content
• Not updating and maintaining
• Not using the HTML attribute rel=”nofollow” enough
• Letting pages get indexed that shouldn’t be
• Unoptimized Page Titles
• Ignoring landing page logic