Page Styles are page designs. It is similar concept to Headings and Paragraph Styles but applied to pages instead. With them, you can make different page numbering in one document such as Roman first and Arabic later just like in academic writings. Alternatively, you can also make a document with different page orientations and/or margins as you wish. You can either use existing or create new ones of them. However, the secret of success in using Page Styles is a thing called Manual Break. This tutorial explains step by step to use them with examples. Enjoy writing!