Google it. You will find pictures. Three of the four in the USA have big heads that extend cheeks past their body lines- nonpoisonous snakes have heads that do not stick out wider than the body. Coral snakes, well you just have to look at the picture then unless you spend a lot of time on memorizing what the color pattern is avoid all the black and yellow and red transverse striped snakes. Several look similar.
Who takes the time to inspect snakes? Had a racer (likely a cousin to the toilet racer) do a figure eight around my feet. One second I was on the porch and the next I was out in the road. Don’t remember that mad dash at all.
As for coral snakes, just remember the rhyme:
“Red, yellow, and black
Grab a stick and give it a whack”