In this article, I would tell you how to create and add a rotating banner to your site. You can use a special module or use blocks for that.

Solutions:

1. Use Advertising module 

   The ad module is a powerful advertising system for Drupal-powered websites. It supports the random display and tracking of graphical (banner) and text ads. Ads can easily be displayed in themes, blocks, or embedded in site content. The module records comprehensive statistics about when and how often ads are viewed and clicked, including a plug-in module for generating graphical time-based reports. Ads can be assigned to multiple owners, each of which can be assigned their own set of permissions. Installation is simple by design. An API is provided allowing the development of additional functionality and integration with other Drupal modules.

2. Create a block and show your banner there.

Every solution of the proposed has its advantages and disadvantages. For example, many people don’t like Advertising module but still use it because there is no better option. You decide!

Good luck!