Development
Apart from using the Sitefinity user interface, you can also develop custom functionality for your website. Sitefinity exposes a rich API that you can use to manipulate pages and content, write custom modules and widgets. If you know ASP.NET, you already have the right skillset to develop for Sitefinity. The major areas of extending Sitefinity are:
Working with pages and content programmatically
Creating custom widgets
Creating custom modules
Adding custom fields to existing modules