Help With Modding

I am pretty new to modding, and the explanation of stuff like jbeam and making vechicles are very confusing to me... so if anybody wants to help explain some stuff or even send me a video link, that would be great! Thanks

 

The wiki is your friend. Everything is there.

 

I think this guide is still correct. Aside from the formatting issues
https://www.beamng.com/threads/tutorial-dummiesmans-jbeam-guide-part-7-multidae.13152/