SEO techniques are classified into two broad categories: the techniques recommended by search engines that are the good part of this article, and the techniques not endorsed by the search engines, the bad part of this article. Search engines try to diminish their effects. One method that is forbidden by search engines is spam by repeating a word or text, without any hesitation, just to get up quickly in search engines.

Some commentators in this industry have classified these methods into "White hat SEO" and "Black hat SEO". The right SEO techniques (white hats) tend to produce long-term results, while the incorrect techniques (black hats) bring time to the site bans in the search engines, in case you discover what you are doing.

A tactic, technique or SEO method is considered correct if it complies with the terms and conditions imposed by the search engines. Search engine conditions are not written as a set of rules and commands. White SEO is not just about following the conditions, but also the following: the content that is indexed by the search engine and then rank must be identical to the content a user sees.

White SEO generally teaches us how to create content for users, not for search engines, and then to make content easily accessible to spiders, rather it is a play with search engine algorithms. White SEO can be done in many similar ways similar to web development that promotes accessibility, although the two are not identical.
Black SEO is trying to improve the search engine rankings in a way that is disapproved of, or including fraud. A technique belonging to black SEO, is to hide a text, that text being written in a color identical to that of the background, in a

invisible or off-screen. Another method is cloaking.

Search engines may penalize these sites if they are discovered using methods belonging to black SEO, or decrease the ranking in the top or even elimination from the database, ie site banning. These penalties can be applied automatically by the search engine through its own algorithm, or manually after a human factor site examination.