Understanding Contractual Capacity: A Real-Life Scenario Needed

I failed Contracts last semester and I'm still fumbling to grasp the concept of contractual capacity. Textbooks explain it in a hazy manner, I need help from you guys to clarify it with a real-life scenario. I mean, Maine socha tha I understand Contract, and then the paper happened 💀. It's a crucial part of Family Law, especially when it comes to property disputes. A real-life example would help me understand how contractual capacity plays out in court. Like, consider a minor who buys a property with their guardian's signature - are they considered a competent party to the contract? How does the court determine contractual capacity in such situations?