Black hat SEO is breaks terms of service at search engines like Google.
Don't use AUTOMATED PROGRAMS.
- Article spinning and syndication
- Blog commenting
- Forum profiles
- Spam press releases
- Article Directory
Don't BUY BACKLINKS
Don't pay for backlinks. Most of them are just junk sites anyways despite their high domain authority. It creates an unnatural link profile/velocity.
Don't join LINK EXCHANGES.
Don't join communities use plugins that trade backlinks. Some of these communities have been banned.
Don't do KEYWORD STUFFING/HIDING.
Don't jam keyword phrases or hide keywords for your on-site optimization.
Don't DUPLICATE CONTENT.
Don't spin or cut and paste other people's content. It won't get indexed anyways.