I want to know which is the best strategy for link development?Is there any free ways to build links?I am new to this field.I think link development can be very difficult to imitate. Sure, a resourceful software engineer can create artificial links and imitate them many times over. Getting multiple, identical links from a reputable news source is difficult.Can you help me ?

I always believe in natural links, write a killer content that people will naturally link to and use other link building techniques such as:
* Forum participation
* Article Marketing
* Blog participation
* Link Baits - for organic linking
* Social Bookmarking etc

In my opinion social book marking is the best way for link development.Most social bookmark services help their users to organize their bookmarks with informal tags.Many of them provide web feeds for their lists of bookmarks.Libraries have found social bookmarking to be useful as an easy way to provide lists of informative links to patrons.It is the easiest method to develop inbound links to the website.It may use to credit your site with back links.