Every front-end developer should know the following

Every front-end developer should know the following: 

- HTML 

- CSS 

- Javascript 

- Responsive design 

- Front-end framework (React/VueJs/Angular) 

- API basics - Browser compatibility 

- Version control (Git/GitHub) 

- Testing/Debugging
- Design basics and you should master your IDE.

- How the internet, and website work