Was wondering what tips you had on tuning and upgrading cars?

Just started playing and was wondering what tips people had for tuning and upgrading cars in the game

Do you have preferred race types, car types, track types ?

Not to sound impolite, but you cannot ask for specific information with an ambiguous question… Race types, driving style, and class preferences would be helpful.

class preference and race type will be the most important imo because you or rather I build/tune around that.

Race and s1-s2 class