Clean Code: Chapter 6 (Objects and Data Structures)

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Summary
-Data Abstraction
-Data/Object Anti-Symmetry
-Law of Demeter
-Data Transfer Objects

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I'm using C#, and I'm the only one working on this code, it's not for an employer/job, it's my own personal project, do you feel like protecting data with this type of structures be the best way? I don't really see or understand any issues with just having variables be public and accessing them from other scripts other than having entire functions dedicated to getting and setting variables