Motor suddenly died.

Driving up a bumpy road last night, almost to the top, hit a mild pothole I
could not see, and the motor shut off. Lights stayed on but no key indicator
or aux power, no radio, work. Motor would not start after. No click, no attempt
crank. I see a decent amount of oil coating the passenger side wiring
harness towards where the starter is. Need focus direction. Competent with
fixing problems with cars, when a car savvy person helps me zero in on the
likely source(s).