I thought that everybody knows how the CPU and the kernel manage memory. Everything else follows. However as a very good developer told me once, "I don't know how networking works, only that I have to type a URL." "How is that possible?" I replied, "They teach it at a school." And he told me "yes, but I studied graphic design, then discovered that I like programming."

Replace and repeat with SQL, machine language, everything below modern programming languages.