Hello, For website SEO, you can use On-page like Title, description, navigation & image optimization and daily work on Off-page strategies like social bookmarking, directory submission, blog updation and commenting will help you in good ranking. I hope this information would help you in future. Thanks!!
you shoul take care about Internal Factors (Keywords and Keyword Phrases, Text Formatting (Search engines pay special attention to content that is highlighted by special formatting - h1-h4, <strong> tags), Website Structure and External Ranking Factors (as already katelinfct wrote - social bookmarking, directory submission, blog updation and commenting)
SEO of a website can be increased by writing more and fresh related content for your website which would help you in backlink generation and traffic and also by forum posting etc one more thing you can add a blog on your site which could help you in increasing your off page SEO