What should I learn to become a backend developer?

PHP is easy for beginners to pick up because it can be embedded in HTML files and has many built-in functions that may not come with other back-end languages.

C# is a general-purpose language used in backend Web Development, creating games via Unity, developing mobile applications, and so on. It is not only used in the Windows platform but you can also use it in Android, iOS, and Linux platforms. It is among the best programming languages for Web Development.

How to become a Backend Developer?