What are some black hat SEO practices to avoid?

Ideally, you won't interview with an organization that condones any black hat SEO practices, but it might be a trick question to make sure you wouldn't use them either. Cloaking, keyword stuffing, copying content from another site, exchanging or trading links, buying links, hiding text, and using a link farm are all underhanded techniques frowned upon—and penalized—by Google.

Hi friends,
Here are the black hat techniques you can use ethically as well. Take note how I am explaining only the positive way of using each technique. I do not advocate the use of it in it's original black hat context. Use these knives as kitchen knives:

• Automatically generated keyword pages
  
• Mispsellings
  
• Scraping
  
• Ad only pages
  
• Hidden text
  
• Blog spam
  
• Link farm
  
• New exploits
  
• IP delivery
  
• 301 redirects
  
• Throw Away Domains
  
• Cloaking
  
• Keyword stuffing
  
• Paid links

Well, there are so many black hat SEO activities which you should not do. So instead of focusing on that, make sure you read and understand the guidelines of the google. Follow them and your site will be safe from penalties.

Black Hat Techniques and Why You Should Avoid Them. Keyword Stuffing. Keyword stuffing is the practice of filling a web page with keywords so that the search engine will think the page is relevant to the search. Cloaking. Link Farms. Link Buying and Link Exchange Programs. Article Spinning.