Learn a lesson from the Valentine’s Day cards I’ve saved since the ‘70s: 10 important rules for sending cards to the ones you love, and tips for deciding which love notes to save ----- If you’re sending Valentine’s Day cards this year, there are some key rules to follow -- and mistakes to avoid. I know this because I’ve been saving Valentines since the 1970s. So I can see which ones got right to the heart of it and which sent Cupid’s arrows slightly off target. Looking through my...