What is happening to an object if it's net force is zero?

Net Force is equal to the product of mass and acceleration.F = ma, where m is mass and a is acceleration

When a net force is 0.

0 = ma, so either m has to be or or a has to be 0 because of the zero factortheorem.

Mass is not going to be zero, therefore acceleration must be zero.

When acceleration is zero, that means it is neither speeding up nor slowing down, but it could still be moving.