In the order of most important, from the point of view of work. I want to know these languages at an advanced level.
Python is a programming language that lets you work quickly and integrate systems more effectively.
Ruby is … A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Emacs Lisp is a dialect of the Lisp programming language used by the GNU Emacs and XEmacs text editors.