Guest posting and blog commenting are the best methods of link building.

Link building is the process of building backlinks to your site. Backlinks are links from other sites to your site. The more backlinks a site has, the higher it ranks on the search engines.

Below are some of today's popular link building methods.
Article Submission
Directory Submission
Social Bookmarking Submission
Press Release Submission
Blog Commenting
Social Media ans Web 2.0 pages

forum and guest posting is the best way to get backlinks for our site/blog

Good to share this particular exact information on backlinks...i strongly agreed with that..

I think
directory submission,blog comments,web2.0 backlinks is

best backlinks building methods......

Article Submission is the best way do it fast....

As per my way:
Forum posting
Blog commenting
Ping submission
Article posting
are the best link building techniques.

Content marketing strategies goes well as per recent update of search engines. Article submissions, local classifieds, blog commenting, forum submissions are the useful submissions in order to build quality backlinks to your site.

commented: -1 for being 7 years late. -3