Hidden Text: If you have any hidden text on your website "Remove it Immediately". Hidden text will get you in bug trouble with the search engines and it's something you should never do.

A hidden link is a link a search engine will follow but no human visitor will see. Hidden text could be keyword written in the same color as the background. If a search engine detects text in the same color as the background it could even ban the site. In fact, it has been suggested that if a website's background color is white and has a table with black background and therefore uses white text inside the black table this could be considered as hidden text by the search engines.
[white background, white text = hidden text = cheating]

Duplicate Content: Search Engines love sites with unique content for human visitors. If you have 4 or 3 different pages on your site with the same article even if you reword it a little bit it would be considered spamming.

Lots of really bad advice is floating around the net. Cheating the search engines is never a good idea, and might rather end up doing very bad for your site. The search engines are always evolving and moving a step ahead of unethical webmasters.

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