Can someone explain how these cells work and why they’re important?
Honestly the most important one would be the one by the equator and you just need to remember that hot air rises and Cold air falls. AND when cold air falls it becomes warm to hot and hot air becomes cool after rising for a while
Hey @charbelbarrak11 
Like @wolf said below, these cells work like convection currents. Warm air rises, and cold air sinks. These cells work together the move warm air to the poles and cooler air to the equator. Remember, from the equator, it goes Hadley, Ferrell, and then Polar cells.
