As parallax websites has only single page and if we need to optimize website for multiple pages and services. How this will be possible using parallax.
To optimize parallax website you need to focus on Meta Tags and the keyword density. Recently i have optimized 4 to 5 parallax website and all ranking on Google. - Use main keywords in Meta Tags - Try to create About Us/Contact Us page (Many Parallax theme provide to create new page as well) - Use main keywords in those pages as well - Try to add main keyword as much time as possible (As a text, Heading tags, Image names etc.) - Focus on Blog (Try to publish one article per week) - Don't forget to add your website in webmaster tool to for crawling request I hope above guide will help you.
As for the content, the first part is it must be unique: This means for example on any given webpage no more than 30% of the information on that page can be identical to another web page on the web. There will always be some level of overlay but 30% is a good number to stay below.