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Hi Sridhar, as Ria mentioned, there are many factors to consider. This is the official MOZ guide; https://moz.com/beginners-guide-to-link-building which has plenty of great tips. Often, we get carried away with focusing on external links when it comes to link building. There should be more focus on authority building, and this comes from many more places than just external sites. High quality external links are certainly a large factor in ranking highly. However, link building strategies also need variety. There are link opportunities EVERYWHERE, which are often overlooked. We wrote a blog post on this, which you can see here; http://www.inmarketingwetrust.com.au/link-building-smart-strategy-online-success/ Hope you find that useful!

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