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Any software developer should be used to having to learn new libraries or languages, but for me, the learning has been a bit extreme. I stopped coding in 1988, when I went into technical management, and I didn’t come back to coding until 2009—a 21-year gap. To say that the landscape had changed is an understatement; I felt like a child on Christmas morning with so many lovely presents, I couldn’t take them all in. I made all the rookie mistakes at the beginning, such as thinking that object-oriented programming is about using inheritance, which it isn’t. But I learned the new syntax and new tools (wow!), and reveled in the amount of information I could get online. I chose to focus on Microsoft’s stack, mainly because of the wealth of documentation available. That was a good choice at the time, but with the .NET Core initiative with its open source, multiplatform approach, it turns out to be an excellent choice. The first applications I worked on in 2009 were ones that optimized and displayed healthcare needs geographically, especially around where to locate treatment centers. That task required complex math (which my wife provided) and serious database work. I went through ADO.NET, and LINQ to SQL. In 2013, I swapped to Entity Framework (EF), when EF 5 supported SQL’s spatial (geographical) types, and then moved to EF Core when it came out.