Learning to read nutrition labels is a skill most of us aren't really taught. It's kind of assumed you can just figure out a nutrition label on your own.
But in fact, the nutrition data you find on nearly all of your groceries actually contains a ton of useful nutrition facts.
Now, depending on where you live, the label will be slightly different and rather than me attempting to generalize how a nutrition label reads, I've included links to relevant websites for various countries.
I would suggest you click on the link for your country and learn as much as you can about reading nutrition labels and understanding your nutrition pyramid.