I'm currently learning C# and I was wondering, what is the point of declaring classes / methods private? Who are we hiding / limiting access to these classes.
Because if someone was editing the source they could just change the tag from private to public. I'm not sure how a user will be able to access these methods and what problems it would cause.
tldr; What's the point of access modifiers.
Member visibility, as this feature is often called, is not a security feature. It is a convenience for the programmer, designed to help limit cross-class dependencies. By declaring a member private, you prevent other code from accessing it directly. This has two advantages:
Member visibility is probably the most important language feature in realizing encapsulation, one of the core principles of object-oriented programming.