Lever

Is a bar that turns against an unmoving point.

What simple machine could help you move something heavy a Lever

It might be able to take care of the job a seesaw is a type of lever the bar or board that you sit on has a fulcrum in the middle the fulcrum is an unmoving part that changes the direction of the force

What it's good for

As said a lever can help you move something very heavy

An advantage

A lever can be an advantage if you want to move something from one floor to another and it has a fun side to a lever can be a seesaw everyone likes a seesaw