When using, especially when first using, power tools, keep your hands and body parts far away from the spinny sharp things. If you find yourself doing something that gets your hands, etc. closer than that, to STOP, and find another way. My uncle taught me to stay at least 6" away from spinning saw blades, router bits, etc. and to use wooden clamps and other tools to hold the part while I drill, rout, saw, etc. so I can do what I want without putting myself in harms way. He taught me this when first teaching me how to use a table saw safely at the age of 8.
I'm 77 now and I still have all 10 fingers and no blade or bit scars. I've managed to injure myself many other ways in my life, and I do tend to leave a little blood mark, usually from a splinter, on almost everything that I've ever built of any size, but fortunately, these have all been little injuries. In other endeavors, like firefighting, I have not done so well.
Central North Carolina