Name a few Black Hat SEO techniques.

[thaichacha]

Name a few Black Hat SEO techniques.

[neelseowork]

We don't follow and don't promote black hat SEO techniques!
even you should also stay away.

[arianagrand]

Paid Links
Spam Comments
Duplicate Content
Article Spinning
Cloaking
Doorway Pages
Keyword Stuffing
Invisible Text

[rscomponentseo]

Content Automation.
Doorway Pages.
Hidden Text or Links.
Keyword Stuffing.
Reporting a Competitor (or Negative SEO)
Sneaky Redirects.
Cloaking.
Link Schemes.

[priteej]

Link Farm
Linkbait and Switch
Link Selling
Spammy Footer Links
Blog Comment Spamming

These are some more black hat techniques..

[RH-Calvin]

Black hat seo techniques help to rank your keywords faster in search engines and generates more traffic in shorter time. But the methods followed are not supported by Google and hence your website can get penalized for following such techniques.