How could you choice the healthful foods in the market?
It's important to read the Nutritional Values in the label and see the product-specific information that could be vary for each product (calories, serving size, and nutrient information).
Then it's important to know the informations about the Footnote with Daily Values (DVs), that are based on a 2,000-calorie diet.
In fact the %DVs gives you a framework for deciding if a food is high or low in a nutrient (5% or less is low and 20% or more is high). You can use the %DV to compare one food product or brand to a similar product so you don't need to memorize definitions or claims.
Be sure the servings sizes are similar, in particular the weight of each product so you can see which foods are lower or higher in nutrients.