How does a MOSFET gate resistor reduce ringing?
Does a MOSFET gate resistor reduce ringing?
No a MOSFET gate resistor doesn't reduce ringing.
Ringing is an unwanted oscillation of a voltage or current. It happens when an electrical pulse causes the parasitic capacitances and inductances in the circuit to resonate at their characteristic frequency.
Do I need a gate resistor?
It depends on the VGS of your mosfet if the applied voltage and current is higher than it rated for YES you should add a resistor if not you don't have to. With a resistor or without your mosfet is always on.
what you are trying to do is well described here