discord.gg/ZN4WkyF Here is a link to the GTA Content Creator Discord. You can find a link there to the Creation Catalogue that holds a massive list of the best tracks from each platform.
My personal basic car recommendations would be Nero Custom for Supers, Pariah for Sports, Sabre Turbo Custom for Muscle, Bati 801 for Motorcycles, Trophy Truck for Offroads, Schafter v12 for sedans, Zion for Coupes, Brioso for Compacts, Contender for SUVs, and Gang Burrito for Vans.
If you're unsure about any cars in game, load up a race by yourself and drive the stock vehicle before buying it and see if you enjoy it
Because its relatively cheap, easy to drive, has plenty of traction, high top speed, looks fine, good customization, liveries, and it out-classes every super car in a proper playlist that dis-allows the top 4 supers