Link building is the process of acquiring hyperlinks from other websites to your website.
I used to regularly follow few link building strategies are:
· List your site in directories
· Write the best guest post
· Write a blog
· Build backlinks using forum, classifieds ads, social bookmarking
· Discover competitors' common backlinks
· Recover your dead backlinks
· Find the strongest competitors healthy backlinks
· Find the most relevant link building opportunities