No offense, but that is a very silly thing to consider "foundational" in 2020. The heavy, all encompassing use of inheritance patterns these days is much less prevalent than 10 years ago, even in the C# community.
Extremely silly, I got a C# job recently after I went about 7 years without touching C#. I forgot virtual existed until my first day when I had to look it up. I would have failed the "what's virtual?" question, yet I am very good at my job (just got a big raise).
No offense, but that is a very silly thing to consider "foundational" in 2020. The heavy, all encompassing use of inheritance patterns these days is much less prevalent than 10 years ago, even in the C# community.
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