This image shows the New Application Extension dialog in its entirety. The first row contains two fields: Extension Name and Extension ID. When you type in a name, that name also appears in the ID field, pre-pended with the word "site". The next row shows Workspace Name and Root Folder. The third row shows Development Environment, which is usually set to "Development", and an optional Sandbox field, which allows you to associate an Oracle Cloud Applications sandbox with the workspace. The radio buttons ask you to either: 1) create a scratch repository just for your own use, or 2) create a new Git repository for this extension.