The ground wires are twisted together and then connected to the GFCI ground. The black and white wires may also be twisted together and then using a jumper wire connected to the GFCI. Hard to say without seeing exactly how it is wired.
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To wire a GFCI outlet with a fan switch, connect the incoming power source to the LINE terminals on the GFCI outlet. Then, connect the load side of the GFCI outlet to the switch. From the switch, connect the power supply for the fan to complete the circuit. Make sure to follow the manufacturer's instructions and all local electrical codes for safety and proper installation.
You can determine if an outlet is after a GFCI by pressing the "test" button on the GFCI outlet. If the GFCI trips and cuts off power to the outlet, then that outlet is downstream from the GFCI. If power is not cut off, then that outlet is upstream from the GFCI.
I'm assuming your 3 sets of wires are black or red, or some other color normally associated with the "hot" wire, a white for neutral and a green or bare conductor for ground. If your GFCI protects only itself and no other receptacles, you splice all the wires of the same color together and attach 'pig tails' to your splice to connect to the GFCI. If your GFCI protects other receptacles 'down stream', you connect only the hot and neutral feed from the panel to the line side of the receptacle. Then you splice the others together as described above and connect your pig tails to the load side. "Line" and "load" should be clearly marked on the GFCI. Your ground in this case is still all spliced together with a pigtail for connection to the GFCI. Line is from the panel. Load is to other receptacles. Getting these reversed will prohibit your GFCI from functioning properly.
It is recommended to have GFCI protection for all electrical outlets in a garage to help reduce the risk of electric shocks. This would typically involve installing a GFCI outlet at the beginning of the circuit to protect the rest of the outlets downstream.
To replace a ground fault interrupt (GFI) outlet with a regular one, turn off the power to the outlet at the breaker panel. Remove the faceplate, screws, and wires from the GFI outlet. Install the new regular outlet by connecting the wires to the appropriate terminals, securing the outlet to the electrical box, and attaching the faceplate. Finally, turn the power back on at the breaker panel.