Hey 388cube_edxr8
Dassult systems are the guys responsible for Catia. It is a very complex and difficult program to get your head around unless you have used some of the others.
I use Solidworks, it is made by the Dassult systems and is the pretty much the same as Autodesk's Inventor.
Not sure exactly what you need to do, but if you are trying to create a complete engineered vehicle your best bet will be Inventor or Soliworks.
If you are just trying to create just some 3D models, programs like Autodesk Studio tools or 3D Max are great 3D modelling packages the animation industry uses. There is also a million online tutorials on these.
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