Ok, so I don't nee to do it the "Free Practice" then....So what is the difference between "tracks" and "circuits"?? I have also heard that if you save a tune to a certain track, the next time you are on that track the tune will be on your car automatically??...
If you tune in free practice then what ever tuning changes you save will be saved for that track and only for that track.
If you tune in the garage then when you save you will need to pick where to save it be it a single track, a few tracks or all circuits or all tracks. This depends in part of the type of car you are tuning.
The difference between circuits and tracks is that circuits are a specific type of track, these would be your basic road courses. The game also has Kart tracks which are different and will have Ovals which are also different. All of these are tracks but not all tracks are circuits.
If you are tuning a kart then you will have an option to save to Kart tracks, you will not get that option for GT cars as they do not run on kart tracks.
When you have saved a tune for the car and track then it will auto load when you go to that track in that car.
Lets say you went into free practice on Road America and saved your changes. If you get in that car on any other track those changes will not be present but when you go to Road America they will be loaded.
If you have did this and decide you would like to use that same tune for another track, several tracks or even all tracks then you can go to your garage, get in that car and choose load setup. You then pick the Road America setup from the list and it will be loaded onto the car in the garage. You can then save and when prompted select the track(s) you want it to save to or you can select all and have it save to all of them.
Play around with it a little and you should get the hang of it. What I generally do is make a few basic changes, steering, brake pressure, FFB and maybe a little balancing to get the car basically how I like it and then save that to all tracks. Then when I go to any track that part is done and I can just focus on setting the things that need to be changed for that specific track.