Black hat SEO techniques, encapsulated by spamdexing, entail manipulating how search engines perceive the relevance of a Web page in a way that is often inconsistent with the search engines' guidelines. Hidden text, cloaking, and blog comment spam are examples of black hat SEO

Black hat can help.. if you are using it with moderation

Keyword stuffing, content hiding, etc are the ways of black hat SEO.

Thank you much for advice me.

follow google
 

If not maintain google algorithm in seo that will be black hat seo

buying traffic, links etc. All are part of Black Hat SEO