Go to the Autoshow to purchase new cars for your Forza Horizon 3 garage.
"Choose Horizon Recommends to be recommended cars based upon your personal tastes, or choose view all to see all the cars on offer."
What is Upgrade Heroes?
The Upgrade Heroes menu allows you to browse cars that have preset upgrade packages available.
Can I buy cars with microtransactions?
You can buy cars in game with Tokens
(Written by Manteomax)