I’m sure if you have ever brought your car to a repair shop at some point or another, they have tried to sell you a tune up. What did they tell you it consisted of?
Older vehicles require a lot more routine maintenance performed when they are due for a tune up, in modern day vehicles that list is a lot shorter. Instead of manual carburetors engines now run on electronic fuel injection which is controlled by the engine control modules, and the timing system is not really adjustable anymore on the average vehicle.
The engine air filters are still replaceable, as well as the spark plugs. We don’t really have to worry about replacing spark plug wires and boots anymore since most now run on individual coil on plug systems.
There is not really much fuel system maintenance available anymore, fuel filters are no longer commonly replaceable, as most are part of the fuel pump assembly. There are still basic injector cleaner kits that can be ran through the fuel tank, and with the correct tools you can run a fuel system cleaning solution that cleans out the engine intake/valves/injectors etc.
It is recommended to get most transmissions serviced around 40-50k miles. A typical service usually only consists of replacing the transmission fluid, unless there is a replaceable filter, then that is recommended as well.
If you take care of your vehicle then it will take care of you. If you notice anything out of the ordinary make sure you check it out and take care of it if it needs to be taken care of. Maintenance is all pretty simple as long as we take care of it and don’t slack until everything goes wrong at once, because that is never fun.
As always, stay safe and have fun!