Explore the intricacies of shallow and deep copying in this advanced JavaScript tutorial. Dive into the fundamental concepts of data types, value passing versus reference passing, and mutable versus immutable data. Learn how to create shallow copies, implement shallow freezing of objects, and perform deep copying. Understand the differences between pure and impure functions, and how they relate to data manipulation. Gain essential knowledge for working with complex data structures and writing more efficient, bug-free code. By the end of this comprehensive guide, master the techniques necessary for handling data immutability and references in JavaScript, crucial skills for developing robust and maintainable applications.