1. Ordinary friends: Write blessings on the greeting card, and sign at the end, such as the name of the friend.
2. Close friends: You can write blessings and add a close signature, such as the friend's name.
3. Elders: You can send a title and signature in the greeting card to your elders, such as dear grandpa (or grandma): XX congratulations.
4. Leaders: When sending a greeting card to a leader, you can write the title and signature, such as the respected name of the leader: XX congratulations.