Types. The types or kinds of snake. Wear snake boots when walking.
See below. Nothing other than common sense. When out in the grass, brush, forest, swamp, etc., watch where you walk, climb, swim, sit etc. So to avoid an unexpected encounter with a venomous snake. Also, don't mess with them if you find them. Many venomous snake bite are the result of intentional handling and mistakes as opposed to accidental bites (which still do occur).