Hi my name is Max with Real Truck. So offset and backspacing are one of those subjects that are extremely important when choosing the correct wheel for your truck. A lot of the time when someone lifts they're truck they will go with a lower number (or negative number) for the offset in order to give the truck a wider stance to help with the higher center of gravity. However, the lower the number the more likely you are to rub at full turn if running a larger tire as well. Stock offset on F150s range depending on the year and vehicles drive..
97-03 0 to 15 offset
99-04 0 to 15 offset
04-08 30 to 40 offset
09-10 30 to 40 offset
11-14 30 to 40 offset
15-17 30 to 40 offset
Lift kit and leveling kit manufacturers not only recommend a size tire to run but they also recommend a wheel size and offset most of the time, so that can be a beneficial guide to use.
Here is a little video that helps explain it visually.
Please let us know if you have anymore questions, we'd love to help you find the right wheel for your application.
Thanks,