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What are the most helpful programming language features?

What are the best (productivity-enhancing, well-designed, and concise, rather than just popular or time-tested) programming languages?

What are the best server side programming languages?

What are the best terminal emulators for Windows?

What are the best server side programming languages?

What are the best languages for backend in web development?

What are the best server side programming languages?

What are the best backend web frameworks?

What are the best languages for backend in web development?

What are the best node.js web frameworks?

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What is the best programming language to learn for backend developers?

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What are the best programming languages for concurrent programming?