What Does BBF Mean?
In photography, BBF stands for Back Button Focus. This is a focusing technique where a button on the back of the camera is used to activate the camera’s autofocus, instead of it activating with a press of the shutter button. Most DSLR and mirrorless cameras can be set up to use BBF, but it is usually not the default setup when you first get the camera out of the box.
A previous tutorial on this website goes into great detail on how to set up back button focus on your camera, as well as explaining why it is a helpful technique.