Navigation: Developer Force | Visualforce (User Interface)
Use Visualforce to extend Salesforce’s built-in features, replace them with new functionality, and build completely new apps. Use powerful built-in standard controller features, or write your own custom business logic in Apex. You can build functionality for your own organization, or create apps for sale in the AppExchange.
We recommend that you start by doing tutorials in Trailhead, and then reference the official Salesforce documentation.
The following resources many not be regularly maintained.