Resting potential is the baseline electrical charge of a neuron when it is not transmitting any signals. It's like waiting for instructions before starting work.
Threshold refers to the minimum level of stimulation required for a nerve impulse to be generated in a neuron. It's similar to how pressing "enter" on your keyboard requires enough force for it to register.
Axon is the long, slender part of a neuron that carries the nerve impulse away from the cell body towards other neurons or target cells. It's like highways connecting different cities and allowing traffic (nerve impulses) to flow.