Think about a toy car that you have to wind up to make it go. When you wind it up, you have to use your hands to turn a little crank. The harder you turn the crank, the more tightly the toy car's spring is wound up.
Now, let's say you have two different toy cars. One of them has a really strong spring, and the other has a weaker spring. Even if you wind up both cars the same amount, the one with the stronger spring will go further and faster than the one with the weaker spring.
Torque is kind of like how tightly you wind up the spring in the toy car. It's a measure of how much twisting force you can apply to something. Instead of using your hands to turn a crank to create torque, though, we usually use a wrench or some other tool to twist something around.
Pound-foot is just a way of measuring torque. It tells you how much twisting force you can apply to something. Imagine that you have a really long wrench, and you use all your strength to turn it. If you were applying 10 pound-feet of torque, that would mean you were using enough force to lift a 10-pound weight with a one-foot-long lever arm.
So, to summarize: torque is like how tightly you wind up the spring in a toy car, pound-foot is a way of measuring how much twisting force you can apply to something, and it's kind of like being strong enough to lift a weight with a really long lever arm.