Hidden text:
The last two points are not true errors, but deliberate attempts to deceive search engines using SEO unfair practices. Hidden text (text color is the same as the background color) enables site owners insert into the page desired keywords without affecting the structure or the visual appearance of the page. This text is invisible defakto for the visitor but will be visible to the search engine robot. Fraudulent use of such methods may lead to ban sites from the search engines and therefore the imposition of the index (database) search engine.
Links Redirect:
Redirection is a difficult obstacle for search engine robots. And thus it is also very uncomfortable in terms of SEO. Therefore, if it is not really necessary, so you need to redirect avoid.
Session:
Some sites use to identify the user's unique Session ID to be exchanged between the different pages of the site with each other in the page address. Such identification number is able to identify users and store information about visitor behavior, etc. However, from the perspective of the search engine robot is very inappropriate. Because every time the robot comes to index pages, and gets a new identifier and thus always considers site for new and re-attempt to index. Because the robot for different search engines, each page a new page.
Search engines can recognize such an identifier, but it is not always 100% and then the website can get into the situation that will contain duplicate content, because the same site will have different addresses just because of this identifier. From the perspective of SEO is duplicate content debilitating factor. Therefore, it is necessary to avoid such identifiers.
[caption id="attachment_2781" align="alignnone" width="250"] Hidden text[/caption]
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