How to properly ground a subpanel in detached garage.

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I am going to install a subpanel in a detached garage.60 Amp is what the subpanel will be.I will need to get an exact length from the main-panel in-house before selecting the proper gauge wiring.I'll be using underground plumbing.Existing wiring from the house to the garage will no longer be used.Should I ground the sub to the ground from the main panel or the new panel?

This is a new install so I would have to ground the subpanel to the main.I have control over all the other variables.

I would run 4 wires from the main panel to the sub, 2 hots, 1 neutral, and 1 ground correct.

At the subpanel, the ground bus bar would not be connected, and the grounding screw would be removed from it.

A GFCI Breaker must be used at the main.Just want to be sure, I believe this is true for any subpanel in a detached building.

Right now, doing this.Sub feed to a shed.There are two hots, one neutral and one ground.There is a ground rod at the shed.That's how you do it.

Any equipment that becomes shorted in itself must always have a ground attached to it and then run to a bar that is grounded to the ground.If there is a chance of a live wire touching metal that the ground should be tied to so that it doesn't go into anyone that grabs a box or piece of equipment or device that is shorted, then it's a good idea to keep it away from anyone.Sometimes ground fault protection devices fail.All grounds should not be tied to a neutral because when a circuit is applied and current flows, it will make your meter run more since it is using current to the earth.If the ground system is disconnected from the neutral, you won't see the current flowing to earth, I think.