i really don’t understand tuning

i’m new to the game and one thing i’m struggling with is gearing. there doesn’t seem to be any guides i understand, and everyone seems to be saying something different and it’s very frustrating and confusing and its making me feel as if there was no point getting the game.

one minute i need to change my gearing according to where the power and torque lines cross on the performance graph when upgrading engine, next someone is telling me to do it via telemetry, gearing depends on what wheel drive i have etc etc

the thing is, the car i was tuning is electric, there is NO cross section on the graph.

is the cross section even relevant or is it simply just where the power line increases cos other people are saying u need to do it where the torque increases?

someone walk me through please i just want to enjoy the game smh