Seal your classes in C#

Summary

The transcript discusses a C# coding best practice regarding class inheritance, focusing on the recommendation to mark classes as sealed by default to reduce complexity and improve performance. The speaker emphasizes that inheritance introduces potential risks like breaking changes and method override complications, and suggests sealing classes unless there's a specific need for extension. The key takeaway is to intentionally design classes with inheritance in mind, using the sealed keyword as a default approach to create more predictable and efficient code.