We have to avoid these things in OUR SEO Tasks.
Because these things are count in Spam.
• Comment posting in irrelevant blog and giving unrelated Link.
• Paid Links (Selling Links for Money)
• Copy the Content Form Other websites.
• Jung or Bulk Submission Like Social Bookmarking and Article Submission
• Low Quality Content with irrelevant anger link
• Bouncing Rate Increasing
• Stuffing Your Keyword
• Giving back links to sites which is banned from Google
• Linking to Irrelevant Website and Content