1. Paid Links
2. Duplicate Content
3. Article Spinning
4. Keyword Stuffing
5. Hidden Content
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1. Paid Links
2. Duplicate Content
3. Article Spinning
4. Keyword Stuffing
5. Hidden Content
Black hat SEO refers to the use of aggressive SEO strategies, techniques and tactics that focus only on search engines and not a human audience, and usually does not obey search engines guidelines.
Great question ..This should be asked before getting into black hat seo..Spamming technique is otherwise known as blackhat methods..These are the following techniques used now a days..
KEYWORD STUFFING,
SPAM COMMENTING,
INVISIBLE TEXTS ,
ARTICLE SPINNING,
DUPLICATE CONTENT,
CLOAKING,
but if u use these techniques they are usually detected sooner or later and your page rank may get lower also be banned..Better advise is use greyhat technique..