In this course, learners discover the importance of exception handling, validation, and parameter checking in programming. Explore how to handle exceptions and apply validation in Java, Python, C#, and Javascript, as well as how to configure component trust and reuse code, in this 17-video course. Begin by learning how to apply exception handling effectively, and then take a look at validation techniques and procedures. Learners will explore reliability, resiliency, and recoverability and how it can be achieved in software engineering. Next, you will look at CDI/UDI (constrained data item/unrestrained data item), why it is important, and how it should be done. You will delve into parameter checking; using Java exception handling; using Python exception handling, and using Javascript exception handling. You will then explore using Java validation; Python validation; C# validation, and Javascript validation. In the final tutorials you will examine component trust, including when and how to achieve trust of components, and learn how to reuse code effectively and defensively.