Black Hat SEO practice is made for aggressively improving search results but unfortunately Once it is caught it will be penalized by ignoring permanently.

If we don't follow rules and guide lines of search engine called black hat seo.
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Black hat SEO is the use of techniques that are not acceptable to search engines..black hat SEO techniques can get their sites penalized by or banned from search engines.

example of some main black hat technique are --

Keyword stuffing
Link farm
invisible text
doorway pages

Can anyone suggest me how we can do black hat seo.?