this quiz will teach you how.
the rules are simple: a single blaze means you’re on the right path, and you should keep going. two same-color blazes on top of each other are a sign that the trail turns. if the top blaze is shifted to the right, you turn right. if it’s shifted to the left, you turn left. (sometimes the blazes will be right on top of each other, and that just means the trail turns and you have to figure out which way.) a three-blaze sign can indicate the start or end of a trail, but many trails make do with just the single and double blazes.
so that’s 