Need help Please someone. I'd like to learn how to make some top 50 leaderboard cars for tracks

Someone please add me and msg me online
For Xbox one. I need help learning how to tune and make cars the best for online leaderboards I’d like to make top cars like them. That wud be nice and to learn how and what to do. Or u guys jus post your builds on this thread so I can see how to edit my car. Post yours please and list the items your car has so I can put. My gt is feared won

there are plenty of open source tunes available, most on the legacy forums some on here,

Hint: tuning marketplace may be a good place to start

If you ask, you’re not ready for it.