I have previously used a little Unity, so I know already how to lauch a project and add objects. I wanted to make a simple scene with rigid bodies. The goal is to make a pyramid of blocks fall by launching a ball on it.

First, I created a project and added a plane and a cube. I need to add a rigid body component to it to have interactions.

Then I added multiple cubes, by duplicating the first one. The cubes are then placed in a empty object to not overload the hierarchy of object.

I then added a C# script to lauch a ball from the camera. It uses the mouse position to direct the ball.

Finally, I wanted to make the scene prettier, so I added a skybox following this tutorial. The assets come from here. I also added a material for all the objects.

The final scene looks like this: