Strings are a core concept in .NET, which all developers must master. This course will teach you everything you need to know about the best practices for working with strings using C#

Strings are one of the most used types in any application you will build. In this course, String Manipulation in C#: Best Practices, you'll uncover everything you need to know about strings to use them effectively in your applications. First, you'll learn how to create strings to represent text data. Then, you'll explore the extensive collection of methods used to concatenate, modify, format and search strings. Finally, you'll discover advanced topics, such as how to use strings efficiently and how to apply best practices in your code. When you’re finished with this course, you’ll have the skills and knowledge required to manipulate strings and to produce high-quality software using C# and .NET.

https://www.pluralsight.com/courses/string-manipulation-c-sharp-best-practices