Forza Horizon 4

Preparation

If you don't care for XP, you want to earn as much credits as possible, I fully recommend using Lamborghini Reventón Forza Edition car. If you don't have it, you can use Ferrari 599XX Evolution or any very fast car or a car that has credits boost.
Here is my tune for Lamborghini Reventón Forza Edition car.
If you want to earn XP more instead of credits, I fully recommend using Alfa Romeo Giulia Quadrifoglio Forza Edition car. You can also use any car that has either clean skills or event influence or speed skills boost.

Here is my tune for Alfa Romeo Giulia Quadrifoglio Forza Edition car.

Also, no matter what car you are using, make sure you have unlocked every single option in car mastery to earn even more credits and XP.

Before you start the race, you should increase difficulty bonus percentage as much as possible. I definitely recommend set 'Damage & Tire Wear' to 'Cosmetic' or 'None' because the car will slowly loose grip and handling even without crashing into something.
Races
Here are down below 3 types of races I've prepared for you, you will get for each race maximum of 200,000 Credits / +70,000 XP Every +15 Minutes. Depending of what car you are using.

Road Race
Go to the race as shown.
Enter the share code.
Enjoy road XP.
Dirt Race
Go to the race as shown.
Enter the share code.
Enjoy dirt XP.
Cross Country Race
Go to the race as shown.
Enter the share code.
Enjoy cross country XP.
XP From Street Scene
Go to the race as shown.
Choose the Alfa Romeo Giulia Quadrifoglio Forza Edition car or any car that has clean skills or event influence or speed skills boost.
Credits From Car Mastery
246,000 Credits Every 2 Minutes
Enter the Porsche 911 Turbo 3.3
If you don't have it, you can buy in the auction house for a minimum of 54,000 credits.
After that, go to the car mastery and unlock all of the options as shown.

Always unlock the top option as it gives you 300,000 credits and unlock all wheelspins so you can get even more credits or cars. In total you would need 40 points to spend. If you want, you can ignore unlocking wheelspin at the top to save 20 points.
189,000 Credits Every 2 Minutes
Enter the Triumph Spitfire.
If you don't have it, you can buy in the auction house for only 11 000 / 20 000 credits.
After that, go to the car mastery and unlock all of the options as shown.

Again, always unlock the top option as it gives you 200 000 credits and unlock all wheelspins so you can get even more credits or cars. In total you would need 23 points to spend.
Buying Cheap & Selling Expensive


Go to the auction house and search for cars that are very expensive to buy. For example, Ford Mustang RTR Spec 5 costs max 8,294,000 credits. Try to find that car that costs less than 7,000,000 credits and sell it for 8,294,000 credits.

Zenvo ST1, Ford Supervan 3, McLaren Speedtail and Shelby 1000 are also another recommended cars to make credits. Ford Mustang Shelby GT500 is also another good car to make credits, but almost nobody sells it.

When you purchased the car you have found, I recommend to install the best tune for it and apply the most looking design / livery so you will have better chances for selling it.
The End
If you found this guide helpful, please consider giving an upvote. I have put loads of effort on this guide.

The End

If you found this guide helpful, please consider giving an upvote. I have put loads of effort on this guide.

[idiot 3]

https://youtu.be/ARTiHkBaBzo