I agree about eye, ear, and lung protection. Trusting one's gut about safety is also good, but, early on, the gut may not recognize potentially dangerous situations. Thus, it's helpful to think about the physics involved in shop operations, and to do little "what-if" mental exercises. Things like, if I'm holding the work piece in my hands, and the bit/blade catches, will the result pull my hands into said bit/blade? And, where is the workpiece or off-cut going to go when that happens?
Those mental exercises will help one to develop good practices, like standing to the side a bit when using the table saw; or, using push sticks, push blocks, or work-holding jigs to keep hands at least 6" away from cutting edges, and not in line with the bit/blade.
The unexpected can be expected to occur at the time when it is least expected.