Any body who can help me how to make a widebody because I have tried several time I failed so any one who can make the tutorial or had made the tutorial?

You don't actually need a tutorial for it, if know the basics of brushing and know how body kits look irl, you can pull it off quite easily.

these videos should help you out. I can draw for shite, but hugo's GT96 video helped me a lot.

https://www.youtube.com/watch?v=tzFRcTN6SgQ

https://www.youtube.com/watch?v=r1dtbaysINw&t=3s