It is the most popular back-end language with the most users. Easy to learn. Criticized by the old designs. Examples: Facebook、Wordpress
Fast development. Many bootcamp teach backend in this language worldwide. Examples: Airbnb、Twitter
The language is simple and easy to learn. There are many applications that are related to data analysis and data mining. Poor performance by using Python alone. Examples: Instagram、Reddit
Front and back-end can both use JS. Extremely in high efficiency by using front and back-end. Not suitable for CPU-intensive applications. Examples: Yahoo、Walmart
Google recommends. It has a comprehensively standard library with good performance. There are few learning resources. Examples: Google、Youtube