What exactly is coupling? I am confused with the H atoms and their spin. (It is dependence of the resonance frequency of a nucleus on the spin state of other nuclei (=its coupling partners) - GS).

What is the difference between electric and magnetic waves? Does one have higher wave frequencies than the other? (A change of the electric field causes a change of the magnetic field, and vice versa, so both components have same frequency. - GS).

I understand the vibration between certain bonds but if one has electric does it vibrate at high frequencies or not? I’m having a hard time grasping the broad idea of it.  (The IR absorption takes place only if it causes a change in the dipole moment of the molecule. - GS).