This article explains the basic idea: David Bertoldi's "How to write your first Quine program" https://towardsdatascience.com/how-to-write-your-first-quine-pro

This article explains the basic idea: David Bertoldi's "How to write your first Quine program" https://towardsdatascience.com/how-to-write-your-first-quine-program-947f2b7e4a6f https://towardsdatascience.com/how-to-write-your-first-quine... However, that article is a basic introduction. This 128-language quine loop is beyond expert, bordering on magic.