Food combinations

Okay, here is the score.  I have done well, yet there are times when I need to know how to fix a meal. Fixing a meal means to determine which foods should go with what.  In other words, I can't just eat two or more things and call it a filling breakfast.  They may be filling, but does that constitute good habits, yes or no?  I would eat 2 servings of cereal with a sandwich.  If I had just one serving of cereal and no sandwich then that would be better.  That is just an example.  Having approximate food samples would be very important in how I need to eat.  I have a lot to learn in this journey.