The door switch is a safety device that is wired in series with the motor circuit.

The purpose of this switch is to prevent the motor from starting any time that dryer door is opened by the user

Some door switches are single pole single throw switches, this mean that all they do is turn on or turn off.

Other door switches are single pole double throw switches, this mean that the switch activate two circuits. One circuit is the motor circuit and the other one is the circuit for the light inside of the dryer drum to see the clothes when you open the dryer door.
 

So, if the dryer won't start and you know for sure that the problem is a broken door switch, then that is all you have to replace

Assuming that the door switch is bad without checking it to be sure that the switch is bad, could be a waste of time and money, you may replace the switch and not resolve the problem

The best way to learn how to do something is by seeing how it is done.
 

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