See further guidance on difference between pages and posts.
Pages are not part of the chronological blog stream and are more suited to static content that does not need to be updated regularly. To add a page:
You can nest pages under other pages by making one the parent of the other. You can do this from the Page Attributes section of the Add Page/Edit screen by selecting the appropriate Parent page from the drop-down menu.
If you want to change the order of your pages: