If you have a website and want to be able to change the content of that site easily and / or frequently, Joomla could be a good choice for you. With Joomla, you can log in to the site and edit the site directly in your browser. You can add new pages and these pages will automatically be added to all navigation.

If you want more than one person to be able to edit the site you can give logins to other people, and set permissions as to whether they can post new content or just submit it for review by you.