There are countless ways you can optimize your eCommerce website to attract the attention of search engines and, as a result, as many 
customers as you need. The art of quality SEO (search engine optimization) has become almost a religion amongst the eCommerce crowd. Many focus on it far more than even their products and services. Out of every tactic available, though, most experts believe backlinks deserve the most attention if you wish to succeed.
For those who don’t know, backlinks are just links on websites that lead back to yours. They tell search engines that other people vouch for your website, thus boosting your SEO.
The first “secret” to building backlinks is actually so straightforward much of your competition may be missing it: you need quality content. Without quality content, no one is linking to your page and, even if they do, you’re not going to impress anyone when they show up.
So make sure you’ve used your keywords naturally in your copy and its titles, meta tags and any links you use. Obviously, you need to vary how you use those keywords in terms of tags and links (i.e. don’t use your main one every single time).
Then optimize your copy with a lot of great images, infographics, videos and more. Search engines will love this anyway and you’ll wow new visitors right off the bat.
Now, here’s where some hard work begins to come into play. One simple way to land backlinks is by searching blogs that cover your topic and leaving your links in their comments. Of course, you want to make sure you’re saying something helpful or answering a question. It’s also essential that you’re commenting on blogs that are relevant to your website. Otherwise, search engines won’t care.
There are countless other sites out there that allow you to post articles, so long as you meet certain requirements. In exchange for the free article, these sites allow a backlink. The more successful the site, the more valuable your backlink will be.
Even better, start networking with people in your industry. What you eventually want is a working relationship where you can post links on their sites, ideally as a guest blogger. This gives you a backlink and authority with their audience. Don’t expect any opportunities if you start the conversation by asking for a favor. It will take a while to grease those wheels, but it will be worth it.
A whole library probably couldn’t fit all the advice out there on backlinks, but the above information is enough to get you started. Just remember: if you try cheating the system by providing lousy information, your time is limited on any search engine.
Source:
http://www.strayblogger.com/seo-backlinks-how-to-build-backlinks/