How to connect an external flash to the camera? I am a layman with photography equipment, thank you

Connect the lower part of the flash to the hot shoe of the camera and connect it to the hot shoe on the top of the camera. Turn on the power and press the shutter button to take the shot after the flash is recharged. The flash I bought a long time ago can be connected as long as the interface is a universal hot shoe interface. If the manual button can be triggered, it means the flash function should be fine. As long as the wiring is complete, it can be used. If you want to do off-camera flash, instead of directly fixing it on the hot shoe on the top of the camera, you can use a wireless flash trigger. The transmitter end of the wireless flash trigger is connected to the camera hot shoe, and there is also a receiver. There is a hot shoe structure on the trigger end that can be connected to a flash. One transmitter end can correspond to more than one receiver. This flash trigger can generally be purchased at a place that sells flash accessories. Domestic ones can be purchased for more than 200. There are also some that can be connected in a wired way, but that requires a common interface on both the body and the flash. I just looked at the parameters of the S100FS, and there is no mention that this camera has a flash interface other than the hot shoe. If you want to leave If the camera flashes, I guess you can only use a wireless flash trigger.