Absolutely!

Your site can be built on a popular CMS (content management system) such as Joomla, which allows the site owner total control over the content, colour scheme, menus, users - the lot.  Once the installation has been done and selected modules installed and configured for your site, you will then get a driving lesson and the keys!

Basic information sites that do not require user regestrations and other functionality can be written in programs such as Dreamweaver or Frontpage and then published.  If you have the software, you can maintain the site yourself.