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Currently in a `front-end position`, mastering the back-end language `Node.js`, but my notes on back-end thinking and logic are weak. I want to learn another back-end language to increase my capabilities and hope to achieve full stack. What back-end language will be more useful in the past? What about good developments?

Don’t hesitate, don’t get entangled

The only thing I recommend to you is PHP

php is the best language in the world, bar none

Learning one more language will not deepen your understanding of the backend. You need to learn a node.js backend MVC framework, and also learn databases, both mysql and mongodb, as well as server deployment and simple maintenance, CentOS or Ubuntu. Once you have finished learning these, you will be able to develop a complete backend and deploy it to the server, then you are ready to get started.

PHP is the best language. Hahaha

Learn Java, now the market usage rate of Java reaches more than 20%, ranking first

Of course it’s Java

It’s definitely PHP, believe me.

What is your purpose?
If you want to make money, just go to JAVA, PHP, or go to any recruitment website. Whichever language has more jobs and a higher salary, learn whichever language.
If you have hobbies, there are many to choose from, such as GO, Scala, Rust, Haskell, Lisp, and Erlang, which can expand your knowledge and improve your skills.

Since it is a front-end, you must have a language foundation, then learn the basics of php, take a brief look at it, get started, and then just start playing laravel!
laravelEasy to understand!

PHP not only means "Personal Home Page",
also means "PHP's Hypertext Preprocessor".
What is Hypertext Preprocessor? It is an HTML preprocessor.
So, where there is HTML, there is HTTP, there is Wherever there is a browser, there is PHP.
jQuery can operate HTML in the browser to achieve interaction, and PHP can operate HTML in the server to implement logic.
They complement each other, and the design philosophy is "Write Less Do More".

Node is a language that allows you to have a good grasp of the background processing process, such as sessions, static file processing, and header responses. You need to handle and write algorithms yourself. Of course, you can directly use the framework.
And the prospect of node is pretty good now.

What you want is project experience, not language. Only project experience can enrich your business logic
Of course, frameworks can enrich your non-business logic

It is recommended that the poster learn PHP. PHP is one of the most cost-effective languages for web development.
You can also learn python. It has many applications, including crawlers, automated operation and maintenance, big data analysis, web development, etc.

Never heard of "PHP is the best language in the world"?

PythonGreat practice, please praise me