Song Dandan was a famous Chinese actress and director. Her three marriages made her a failure. However, through her married life, she understood many things. 1. Marriage needs management. No matter how much two people loved each other, they needed to constantly put in effort and care in order to maintain the stability and longevity of their marriage. Song Dandan found that she had made many mistakes in her marriage, such as being too self-centered and lacking communication. These mistakes led to the breakdown of her marriage. Therefore, she realized that marriage needed constant communication, compromise, and improvement. Marriage requires mutual support. In a marriage, both husband and wife and both parents needed to support and help each other. Song Dandan found that her three marriages had encountered financial problems, which made her feel that she lacked support in her marriage. Therefore, she realized that marriage required mutual support and both parties to work together to overcome difficulties. Marriage requires rational thinking. In a marriage, both parties needed to think rationally. Song Dandan found that her three marriages were affected by her emotional drive, which made her decision irrational. Therefore, she realized that marriage required rational thinking. Both parties needed to fully understand each other's needs and thoughts in order to make wise decisions. Marriage needs respect. In a marriage, both parties needed to respect each other. Song Dandan found that her three marriages had problems with mutual disrespect. Therefore, she realized that marriage needed respect. Both parties needed to respect each other's opinions, needs, and feelings. Song Dandan's three marriage experiences made her understand that marriage needed management, mutual support, rational thinking, and respect. These principles were crucial to any marriage.