Future Growth of Programming languages.

Hi! I hope you are all doing good. I'm a student of software Engineering . I'm doing a research that in future which programming languages will be on top. Currently I'm doing front end web development. But I want to learn back end development. In back end which programming languages should I learn that is growing and there will be scop in future. People are saying to me that popularity of react.js and node.js is increasing. Can anybody refer me any link where I can find that which programming languages are going to be popular and which languages are decreasing its community. Thanks