I believe you are talking about car design and suppliers? There exist helpful guides by
Joey Mclane and
Gerard VC JB17 that I believe would help you regarding car design.
Prioritize on the "Big 4" (Acceleration, Braking, Handling, Downforce) first, with Fuel and Tyre economy being of lesser priority, while you can leave aside Cooling and Reliability for now as they don't have much of an impact on the game atm. As the guides indicate, you do this by spending your own car design points generated by your HQ, researching other cars for extra design points, and by choosing your suppliers wisely.
Also the lower your car design, the more you would gain for each next point of car design. What I mean is, the gap in performance between 1 to 10 Fuel Economy is much wider than the gap between 80 to 90 Fuel Economy, for example.
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