Where should you begin creating an application in Appian?

Creating an application in Appian begins in Appian Designer because it is the primary interface where you can develop and configure all aspects of your application. Appian Designer provides the tools and visual components necessary to design process models, user interfaces, data types, and actions that comprise an application. This environment is tailored for application development, allowing you to utilize various features, such as drag-and-drop functionality, to streamline the building of your application.

While the Administration Console is used for more advanced configurations and settings related to the overall Appian environment, it is not intended for the actual creation of applications. The Application Site serves as a user-facing area where users can interact with applications, rather than being a development environment. The Knowledge Center, now a deprecated term in the context of Appian's platform, was previously a resource for documentation and support but does not offer tools for application creation. Therefore, starting your application development in Appian Designer is the most appropriate choice, as it is specifically designed for that purpose.