How to make Mod in beamng

https://documentation.beamng.com/. and also try watching some youtube videos about modding beamng if you wanna learn more

I need to understand jbeam files to modify the mod like envoy power transmission handling a lot of things it not really hard u will finde simple video on YouTube and then learn the basics of blender so u can modify the car body chassie make it widebody things like that