1. Social Media - Social Media turns out to be the new King in the field of SEO. You can’t ignore the king. Ignoring the king is like Ignoring yourself to be in the country. The Social media sites like Facebook, Twitter, Google+, LinkedIn, Tumbler, Stumble upon etc. helpes to gain more followers to your site.
2. Search Engine Submissions - You can submit your website to Popular search engines like google, yahoo, bing.
Google's Link Submission Page
Bing's Site Submission Page
3. Blog Posting - You can write a blog in which each blog was a link back to a website.
4. Social Bookmarking - You can submit your website to social bookmarking sites.
5. Directory Submission - You can submit your website in High page rank directories like DMOZ related to your niche.
6. Guest Blogging - You can write a blog as a guest in various blogging sites.
7. Blog Commenting - You can build your link through blog commenting.
8. Article Submission
9. Forum Signatures
10. Local Business Listing
11. Press Release
12. Video Sharing