The document discusses polyglot programming, which refers to knowing and using multiple programming languages together. It notes that polyglot programmers are not "rockstar programmers" or "spy programmers" but rather focus on using the common web platform. Becoming a polyglot programmer requires deliberate practice, involvement in language communities, practicing through projects, and being willing to take risks. The document outlines some challenges of polyglot programming like a lack of direct revenue potential or chance to practice. It also provides some recommendations for languages to learn, including C, C++, Java, JavaScript, Python and Ruby.