How to connect the camera with an external flash? I am a layman in photographic equipment, thank you (I can't ask questions when I am selected for the recommended answer, which is more troublesome)

The connection between the flash and the camera can be divided into two ways: one is direct connection, with hot shoes and online connection, and the connected sockets are divided into "X" and "FP". X is the synchronous jack of the flash for 10,000 times, and the synchronization speed depends on the camera; FP, a jack with time delay, is specially used for flash bulbs. It was widely used in early cameras, but it is basically not used now. The other is wireless trigger: the light signal in a certain range is received by the photosensitive element (diode), thus triggering the opening of the flash lamp. This trigger signal comes from the camera's own flash, or it can be another flash synchronized with the camera shutter.