These are some ways to be used to improve search engine rankings:
1. High Quality Content:
In order to increase Page Rank you must have unique quality content which your readers want to share with their friends.
2. Site Submitting:
To boost Page Rank you must have high quality Backlinks and the best way to generate quality backlinks is to submit your site on different web directories and article directories.
3. Guest Posting:
This is one of the most used and best technique to increase Page Rank. Most Blogs have options of guest posting through which you can post at their blog and get two or three backlinks in return to your blog this really helps if you are posting on good Page Rank Blog with the same Niche as yours.
4. Link Exchange:
This is one of the most old techniques but it still works, in order to get a good PageRank you should get higher Page Rank sites to link to your site, through this you will firstly get a good Page Rank and will get traffic from that site.
5. Keep Updating:
Google really likes Sites that keep their content fresh and unique. The more you post, the more Google will crawl your site and the more chances for you to increase page rank

6. Link Building
Commenting is a very crucial process in generating a good Page Rank. In Blogging Community you must be very socially active. Some Blogs are Do-Follow, which can help you generate back links to your site by just commenting on their posts.
7. Social Bookmarking:
Social Bookmarking is a very effective method to increase Page Rank because by sharing your Site on different Social Sites you will get a free Backlink and Traffic.
8. Website Accessibility:
If Your Website is down for a long period of time, Google may reduce the ranking of your site. So You should always keep Your Website accessible.
9. Using Commonly Searched Keywords:
As You know people search using keywords and not the whole sentence so if you have used a keyword which is very frequently searched then you get a higher chance of your website being visited and MORE VISITORS = BETTER PAGE RANK.
10. Blog Advertising:
You can make an Ad or a banner for your site and advertise it on different website, through this you will get good back links and traffic.