On-page optimization (website optimization) can be divided into two branches; factors that depend to the structure of website and factors that depend to content you write.
Website Structure Factors:
o Domain: Before you pick a domain name you should know your target audience, and what you intend to sell to them. Try to use major keywords in your domain. Using a .com version of a URL is better than other versions.
o Contact page: Design a contact page and put your E-mail and mail address with phone number.
o FAQ: design a Frequently Asked Question Page. I think each website needs a FAQ page, but it depends on you.
o About Us: It is necessary everyone visits your website knows who are you, so design an About Us page.