You want to bounce the light from the flash onto the subject via ceilings, walls, or other objects to get better results.
When using a flash, you usually don’t need a handheld light meter, especially when using a dedicated flash that communicates with your camera.
the synchronizing the firing of a photographic flash with the opening of the shutter admitting light to photographic film or electronic image sensor.
Evaluative through the lens.
When you shoot faster than the camera sync speed, the second curtain starts to close before the first curtain has fully opened, resulting in the exposure being captured by a slit that travels down the frame.
Bounce flash diffusers provide a different approach to softening the light. Instead of shooting the strobe forward towards the subject, they “bounce” the light away from the scene.
In photography, a slave is a flash unit set to slave mode which will fire when it detects the output of another flash unit.
Use a faster shutter speed to reduce the amount of time the sensor is exposed to light.