1.Your social circle
2.Niche communities
3.Writing guest posts
4.Create a blog related to your business
5.Contact Trustworthy directories
6.Add a Testimonial
7.Research back-links of competitor
8.Use Infrographics
9.Case Studies & Reports
10.Newsletter Subscription
11.Dead back-links
12.Social Media
13.Sharing Widget
14.Surveys and Quizzes
15.Run an Affiliate Programs
16.Transcribe Videos
17.Get Interviewed
18.Content Syndication
19.Link building on Wikipedia
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