Useful SEO tips for your website :
Unique Content : This is the most important step for SEO of a website. Adding unique and fresh content gives an edge over your competitors which helps in Google rankings. Google hates duplicate content and wont index your site.
Directory Submission : Adding your site to directories like dmoz.org gains you large number of visitors and helps in SEO of your website. Submit your site in directories which are active and not ones which are dead.
Forum Postings : This is one of the most useful SEO tip. Register and post about your site to high PR dofollow forums. This can improve your page rank and thus can improve your ranking positions. Do forum postings only in your niche category which suits your site.
Blog Commenting : Yes blog commenting can be useful for SEO. Comment on dofollow blogs which can improve your page rank as well as visitors to your site. Do not be spammy, read the blog carefully and comment about the related post.
Article Submission : Submit your website to sites like ezinearticles.com, which has a high page rank and high possibilities of getting your article on first page of Google for related keywords. Article submission can improve your page rank and ranking positions.
OnPage Optimization : One of the important SEO tip for your website. Analyze your site properly, insert keywords into your website with proper keyword density method and follow proper internal linking method.
Link Building : Keep on increasing your backlinks monthly, this will help you over your competitors. Do not follow any black/gray hat seo methods.
Social Bookmarking : Yes social bookmarking helps your site in increasing ranking positions. Keep on submitting your sites to social bookmarking sites like digg, delicious, reddit, etc which can increase your visitors.
Sitemap : Upload a sitemap to your site, which helps google bots to easily index your site. You can generate a sitemap or can manually make one.
robots.txt : Adding a robots.txt file tells google bots which pages to index and after how many days to index your website. You can check this in webmaster tools.