It’s exciting to see someone who matters to you finally succeed at something they’ve been working hard for. Whether that’s a family member or a friend, it’s a gift to see someone who’s been doing their best get their just rewards. A great way to acknowledge their achievement is to send them a congratulatory card.
Theoretically, you can congratulate people for pretty much anything. It’s appropriate to send a card out in that sense. Wouldn’t you love to get a card from a loved one after you do something that you’re incredibly proud of? There are key moments that call for congratulations, such as: