I would suggest looking at Niklaus Wirth's Compiler Construction book and even the Oberon compiler. This is one of the best ways to learn about compilers and w

I would suggest looking at Niklaus Wirth's Compiler Construction book and even the Oberon compiler. This is one of the best ways to learn about compilers and writing programming languages. See: https://www.inf.ethz.ch/personal/wirth/ https://www.inf.ethz.ch/personal/wirth/ Another approach is to look at SICP, it is Scheme oriented and more oriented towards macros. See: https://mitpress.mit.edu/sites/default/files/sicp/index.html https://mitpress.mit.edu/sites/default/files/sicp/index.html SQL is a deceptively complex language, the optimisations that it performs are very complex. Markdown, on the other hand, is more of a transpiler to HTML and is not Turing Complete.