The Lumion version you have bought will constrain what you have available in each library. The following list gives you a good overview of what is available in Lumion Pro:
The nature library: As you can see in the following screenshot, in this library, you will find more than trees. The Clusters tab is a lifesaver for when you need to fill the landscape with loads of trees. Since they are far away from the camera, the clusters of trees Lumion provides are good enough to fill the scene.
The transport library: This library encompasses all sorts of transport, including railway and air transport, which you can see in the following screenshot:
The sound library: Usually, this library is used later in the project when you want to add nice touches and bring life to your scene using the sounds provided in Lumion. This is not the only way to use sounds in Lumion because there are some effects you can use as well.
