37. List out some black hat SEO techniques and explain them

List of some black hat SEO is given below:

Using Unrelated Keywords

Using unrelated keywords which has high search queries in the search engines, and adding that keyword to the content.

Stuffing Keywords in the Content

Using the main keywords over and over again and increasing the keyword frequency. 500 words need to have 2-3 keyword density, but keyword stuffing increases the keyword density to 5-8 and more.

Hiding Keywords

Hiding  the keywords in the web page with web page’s background color so it will not be deducted from the Google.

Duplicate Content       

Using the content of a page that is highly ranked by many website visitors on our page.