Blog entry by Alex Hazel
You need to agree with me that while ranking any page in the search result Google considers the number of backlinks your website has. Without off page activities, your website is not going to rank anywhere.
Important Factors that Google Considers while ranking any page
The no. of referring domains that your website have
What is the page authority of the linking website?
Authority of the linking page & domain
The number of do-follow links
Links which are relevant & within the niche.
To ease your burden, I'm mentioning the list of approved backlinks here. Have a look at it.