Honda 1991 accord need to know if my crank shaft turns or works properly?

I'm a big time beginner so if I sound stupid please forgive me anyway. I was driving and belts ripped off I think what caused the entire situation was my power steering pulley I needed to replace it, it was really bad had the whole squeaky noise thing goin lol, but I figured I had more time… Well any way while car was running I was hearing a lot of grinding so I pulled over and saw all my belts were really wobbly I thought I could make it home but both the belts ripped on the way there. Which lead to my car dieng.so after I got the car towed home I noticed my harmonic balancer was almost all the way out and bolt was the only thing keeping it on which came out rather easily so I guess it's gotten lose over time? The key was stuck on the shaft… So right now I want to see if my crank shaft turns i don't know exactly how to do it cus I don't even know what the crank shaft is for.( I was told to make sure my engine can still crank if that makes any sense, before going out and buying parts?) Also i need to find out what caused this or if my power steering idea was the cause of everything…

A hard lesson: if something is going very wrong with the engine pull over and get it towed to a place where it can be fixed. At that point the engine was almost certainly repairable, but now I have doubts. What I'm afraid has happened, as a result of the loose crank bolt, is that the timing sprocket on the crankshaft has slipped off the key, which will crash the pistons into the valves. The engine can run without either of the external (accessory) belts but when the timing belt stops working the engine dies, usually bending valves in the process.

Finding out if the engine is repairable is now beyond your skills. A mechanic can measure all the valve clearances to look for bent ones and will inspect the nose of the crankshaft if the valves are good. If those are all okay the engine is probably worth repairing. $150-$200 should cover it.

Sometimes I wonder how many engines are destroyed by trying to get home because it is "just a few miles away."

The crankshaft end is the shaft the key is stuck on. What they mean is does that shaft still turn when cranking or when started, that would confirm engine is not frozen and if it runs that means timing belt behind cover is OK. But don't run long with no balancer or belts on, just short start to make sure engine still runs.

It was bad idea to run without power steering problem being corrected, but most likely harmonic balancer coming loose is what caused power steering belt squeaking noise to start with. Also the key in crankshaft end might not be actually stuck, often those keys are long and go back thru timing belt gear to drive it also. If key is badly damaged you might have to remove timing belt, etc to get gear off to replace key. And if crankshaft is to badly damaged that even new harmonic balancer doesn't fit snugly, well… It's probable engine time or new car.