Working on an animation project should start with creating a new scene. There are two ways to do this.
First, you can click the Start New button on the splash screen that appears when you run Cascadeur:
Second, you can select New Scene from the File menu:
Either way, this will create a new empty scene:
A newly created scene in the Viewport window
Alternatively, you can load a pre-existing scene to use it as a base for your work. As with creating a new file, this can be done in two ways:
First, you can select Open... from the File menu:
A standard Open File dialogue will appear. Use it to specify the file you need to open.
Second, you can open a folder that contains the file you need in any file manager and double-click the name of the file:
Either way, the file you've chosen will be loaded to Cascadeur and shown in the Viewport window:
The cube.casc (included in the installation package) file opened in the program
Working with scenes is done mostly in the Viewport window and involves using instruments that can be found on the Toolbar and Timeline.
Cascadeur installation package includes several example files that you can use as templates or as means to learn about software's features. These examples are located in the scenes folder.
cube - a simple scene including one cube (rigged and ready for animation)
simple_model - a scene containing one simple character model
standard_model - a scene with a more complex character model
backflip_animation - a complex animation of a character (same model as in the standard_model file) performing a backflip. Makes use of Cascadeur's physical tools such as Ballistic Trajectory.