Hello friends,

Please tell me Name few Black Hat SEO techniques?

Unrelated Keywords.
Keyword Stacking and Keyword Stuffing.
Tiny Text, Hidden Text, and Hidden Links.
Cloaking.
Doorway Pages or Gateway Pages.
Bait-and-Switch or Page Swapping.
Duplicate Content or Mirror Site.
Spam Blogs or Splogs

• Keyword Stuffing & Keyword Stacking
• Hidden Text, Hidden Link, Tiny URL
• Unrelated Keywords
• Cloaking
• Gateway Page & Doorway Pages
• Duplicate Content
• Spam Blogs
• Link Farms

Link Farms are one of the most popular where you create websites that just for the purpose of creating links to your sites.