A Ford Explorer is a different class of vehicle - mainly it's one of those "brute force SUV" you did things with it.
So, looking at a 2013 Ford Fiesta - everything will rust (corrode or oxidize) if you don't take care of it.
But the Fiesta has a lot of things that are nooks and crannies that - if not found and checked - you can develop problems with.
I presume you have an automatic, that system uses cables to select - and electrically communicate - to your cars transmission.
You just have to keep road debris and leaves, small critters and things that would otherwise block airflow to cool the transmission.
The Cable system uses grommets and bushings for selector control and wiring for gear downshift and upshift and very little is left for the owner to mess with or think about.
Don't have the Auto? Ok - Manual then puts you more in the drivers seat...
So with you and your shifter, the Fiesta uses an Twin Cable system hooked up in a way to form a X - Y axis and the shift pattern is as you run thru the gears, one axis selects the Up and Down - the other axis selects the 1,2 or 3,4 or 5 / R "forks" that you guide the knob thru to which the lever (the stick) it's hooked up to, moves the X - Y cables and you select your gear using this system.
So to help - the "forks" push your gears onto and off of a shaft - so think of this as the "Y" Up or Down - Push or Pull - Pull then Push (the other gear on that fork) then you shift a small amount to the right -
If you take your console apart - you'll see how the stick shifter is mounted, into what looks like a cue billiards ball and the X / Y cables string out from its mount or cradle.
Then the rest of the hard stuff is then the clutch and the throttle and brake
The automatic uses a similar system, but it's controlled thru servos, or actuators - they figure out the hard stuff - you just send input "electrically" to it - Throttle Brake and Shifter select-gear and any other "buttons" on the knob to help with drivability and in some instances - gear selection. Getting out of Park is one of them