I think they are very tricky to steer.
Low friction with whatever they are going over. High inertia of vehicle. So you can spin the vehicle on its axis, but it's still going in the original direction, but facing backward.
That said. All terrain vehicle. Propulsion can be be enclosed. Goes up hill with enough power (or maybe a front winch ?) so quite attractive to the military and (in theory) farmers whose fields are liable to flooding.
Generically hovercraft are "low flying aircraft" using the "ground effect" like the infamous (and even noiser) "Caspian sea monster." Ground effect is (loosely) the aerodynamic equivalent of the electromagnetic "near field" of lens or antenna, extending roughly to an aircraft wing span. Cockrell through "Why not create an artificial ground effect?" Today "air pads" are probably most used to move big stuff (like the F9 rocket) around factories with little effort.