Read the ingredients on the label of the bag. Some flours are made with winter wheat,me with summer wheat. there are basically 4 types of wheat flours - from "soft" to "hard" -
cake flour has a delicate gluten (protein) structure - made with soft wheat
pastry flour had a little more structure (protein) and is great for pies, muffins, cookes,, tarts, biscuits - made of soft wheat but not as glutinous as all-purpose
all-purpose - for anything - a combination of hard and soft flour
bread flour has a stronger gluten structure used to make white bread, rolls, buns, hamburger buns, etc.- made with hard wheat
and then there is self-rising - which has leavening added (baking powder and salt) and will lose it's potency after a while so use before expiration date
whole wheat or graham flour is milled from the entire kernel of wehat containing the bran and the germ - makes a heavy bread - that is why many use half wheat and half white
durum wheat is great for making pasta - gluten-rich wheat
sometimes you are just paying for the name