Wordpress Posts and Pages are subtly different;
PAGES are generally reserved for "static" information, such as about us, contact us and other information that rarely changes;
POSTS are typically used to communicate changing information, such as news items, blog updates, or a collection of articles or stories.
Some people like to list their posts on their home page and others like to have a static home page, with a news or blog page that lists all the posts elsewhere. For example, on the Purple Dog Design website, we have a static home page - with a small footer section that shows a few recent posts (news). We also have a dedicated news page that shows a longer list of news items (or posts).
Here is the official definition from Wordpress:
Posts are entries listed in reverse chronological order..... If you have created any sticky posts, those will appear before the other posts. Posts can be found in the Archives, Categories, Recent Posts, and other widgets. Posts are also displayed in the RSS feed of the site. You can control how many posts are displayed at a time
See Posts for more detailed information.
Pages are static and are not listed by date. Pages do not use tags or categories. An About page is the classic example. Pages can be displayed in the sidebar using the Pages widget, and some themes display pages in the navigation at the top of the site.
See Pages for more detailed information.
How many can I have?
There is no limit on the number of posts or pages you can have - it's all about where you put them! We can help with that - get in touch if you're not sure or would like further assistance.