Further reading

• Abstract classes can’t be created on their own, but they are excellent solutions when you want a consistent base class blueprint that other classes can inherit from. Many of our solutions in this book rely heavily on abstract classes to provide an abstraction layer between class blueprints and their concrete implementations. You can find more information at https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/abstract.
• Stacks are a last-in first-out collection of objects, which makes them ideal for storing and retrieving the most recent elements in any given set of data. If these are new to you, check out the documentation at https://learn.microsoft.com/en-us/dotnet/api/system.collections.stack?view=net-8.0.