An object in Ludus can be anything a text, an image, a video, an iframe, etc. But they all share common basic properties. Everything you read here will apply to every kind of object.
You can add an object for the left sidebar, that we call the toolbar. It's pretty much as you would expect you click on an icon and it will add the related object on the artboard.
Every basic object has a shortcut:
R for rectangle
C for circle
Once you've selected an object all its properties are avaialble in the right panel. It's always the same logic: layout properties at the top, display properties just above. Below these common properties you'll get more and more specific properties.