Where does the charger connect to my watch -7

The puck magnetically attaches to the back of the Apple Watch.

The other end plugs into a USB-C port on a personal computer, or a recent Macbook Pro, iPhone, iPad USB-C charger, or sny vendor’s USB-C charger. A 20watt or higher USB-C charger will enable Series 7 Fast charging.

It's magnetic...

Attach the Watch here:

Attach the power adapter here:

You also need one of these power adapters:

• Apple 18W, 20W, 29W, 30W, 61W, 87W, or 96W USB-C Power Adapter
• A comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD) of 5W or greater