Here are two steps to help you measure flour precisely, which is especially important in baking.
Instead of dipping the measuring cup into the container of flour, use a spoon to scoop the flour into the measuring cup, piling it slightly over the top. This prevents the flour from being packed so firmly in the cup that you would have more flour than the recipe calls for. It also ensures that the cup is completely filled with flour, without any gaps on the sides, so you don't end up using too little flour.
Once the cup is generously filled with flour, gently run the straight edge of a knife over the rim of the cup to level the flour, sweeping the excess back into the original canister. This avoids waste and guarantees that you measure exactly the amount of flour called for.
Note: Items such as baking powder, baking soda, and spices come in containers that make measuring easy; run filled measuring spoon under the lid or perforated flap to scrape excess back into the container.