There’s a book called CLR via C# that explains the inner workings of the CLR from the standpoint of a C# programmer. I’ve learned more about JIT compilers, static typing, object oriented programming, and language runtimes in general from it than I ever would have expected. I also work in Elixir at my day job, and that book doesn’t describe the BEAM directly, but it gave me a pattern for how to think about how BEAM works that maps better than you might expect.