@Meythia linked the thread for beginners with the 2 Praiano tunes I would recommend for that race. Also, have some tips in there too. But I also wanted to throw in my 2 cents about other credit-grinding races and the Clean Race Bonus (CRB).
Easiest with the best payout -
Europe Circuit/Sardegna Road Track/WTC 800/ 15 lap(s).
Vehicle - Bugatti VGT - The only tuning changes I have on mine are 72 on the ECU Output Adjustment, 198 Ballast, -13 Ballast Positioning, and 70 on the Power Restrictor. Racing Hard Tires. I don't change the Fuel Map on laps 1-5. Change to Fuel Map 4 on Laps 6 and 7. Change to Fuel Map 6 as I'm pitting after lap 7. Refresh tires and fuel during the pit stop. Change back to Fuel Map 1 towards the end of lap 11 and the start of lap 12. There are a few turns in this race you need to slow down a lot for or this heavy car will take you into the wall. But other than that it has great acceleration and handling despite all the weight. Top-tier cockpit view and one of the best in VR. There are faster cars for this race but I highly recommend this to a casual driver for the reasons just mentioned and the one pit stop. I think the only way you don't get the CRB in this race is if you pass someone during a yellow flag.
One of the most fun (in my opinion) and great payout -
Europe Circuit/24 Heures du Mans/WTC 700/ 30 Minute(s).
So many vehicles to choose from in this thread. My all-time favorite is the Mistubishi GTO Twin Turbo. I primarily use a tuning for it which was highly influenced by a Youtuber's tuning for a different vehicle. But Praiano's tuning for that vehicle works great too. I think that vehicle is great at catching vehicles in the straights even when you run FM4-6. Plus it's just fun to drive and the all-wheel drive helps when it rains. The vehicle pops up in the Used lot but can be obtained for free by getting Gold in the first license test. Race is also one that almost always yields a CRB. Watch the rain radar toward the end of lap 2 and if mostly all the light blue, you can stay on Hard Tires and only need to pit if you need fuel. If there are a few patches of dark blue, you should pit and go with intermediate tires instead of heavy wet ones. If there are a lot of patches of dark blue or other colors like yellow, pit and go with Heavy wet tires.
*Underrated race with good payout for quick credits -
America Circuit/Trial Mountain/Hyper Car Parade or AmericanCup700.
Using a fast VGT car here lets you overtake and get into 1st place as soon as possible so you don't lose the CRB. Don't get too hasty with passing in the first part of the race until you hit the straight tunnel. That is where you should do most of your overtaking. Tomahawk S can be used on either race and almost unfair acceleration and handling allow overtaking in other areas of the race. This race is great if you are 100,000 credits shy of buying a vehicle or tuning one and you'd rather do those things in under 10 minutes instead of the 24+ minutes you need for the other credit grinds. Losing the CRB is the one thing that keeps this race challenging because you don't have to manage fuel or tires and there are tons of ridiculous cars you can use like the EV VGTs.
