You can get many back links from several forums, blogs, directories, bookmarks, articles, press reports, social networks and images, videos sharing.

There are many ways to get backlinks to the website, forum posting,blog commenting,article submission, these are efficient ways for creating backlinks.

Forum Posting, Guest Blogging is the way to get back-link.

Good content on Blog, blast it out on social bookmarking sites (Reddit etc).

Participate on forums and provide very useful contributions, then provide your site as signature backlink.

Guest posting, forums and comments (without spamming), directory submissions, etc

How get many backlink.
 

Check your competitors backlink. It's also useful to check how many backlinks your competitors have.

The best way is create lots of linkable content. Blog, Article, Guest Post, Press Release etc.
Because there is nothing better than good content to get back links Gooogle love content very much.

by this ways:
Social Bookmarks
RSS Directories
Article Submissions
blog comments

Google's new algorithm is smart enough to recognize between spammy backlinks and genuine backlinks. You will able to generate backlinks automatically if you have good content

article marketing

Internal link your post with each and a every post you have written generally people don't follow it but it gives a great result.

There are various off page tasks available that provides quality backlinks. Some are Social bookmarking, Forum posting, QnA, Blog posting, Edu posting etc.

Getting backlinks is a time taking process, so keep working with consistency, social book marking, posting informative content in forums, submiting url to directories, relevant comments on blogs or websites are some of the methods to get backlinks.

Would suggest hiring someone on fiverr!

I thing, I found more quality back links through of theme base blog commenting.