5. CSS PreProcessors
Understanding CSS is important but sometimes, it is limited. When a project grows, CSS grows with it and becomes tough to manage. CSS starts demanding more time and effort which can be avoided using CSS preprocessing.
Sass, Stylus, and LESS are some of the most popular CSS preprocessors. No website today is complete without CSS and learning CSS preprocessors will surely increase your frontend development skills.
6. CSS frameworks [Bootstrap]
Bootstrap is the most popular CSS framework. Understanding bootstrap is not that tough but implementing is.
7. Responsive Design
Today, websites are not limited to the desktop. In fact, more people access websites on smartphones rather than traditional desktops. The size of the screen varies from device to device. So responsive design is designing the layout of a website in such a way that it automatically adjusts itself according to the size of the screen.
It is very important for a frontend developer to have responsive design skills, and if you need an online course to learn Responsive web design then you should check Web Design for Beginners: Real World Coding in HTML & CSS course by Brad Schiff on Udemy.
8. Testing and debugging
In modern development, a developer not only develops but also test. Well, most of the teams always have a separate testing team but a frontend developer should also be capable of testing. A frontend developer should be aware of different testing techniques such as functional testing and unit testing. Moreover, it is also recommended to know testing frameworks.
It does not matter what kind of developer a person is, debugging skills are always necessary. So always work on your debugging skills. Such skills are enhanced only when you code carefully.
9. Version control systems (Git)
Tracking the code is important. Sometimes you may need to make changes, or revert the code or track the developer who worked on a part of the code. The version control systems are used for such trackings.
Knowledge of version control systems is necessary when working on a real-time project with a team. Git is the most popular version control system. Git has various commands and it is not tough to understand it.
10. Chrome DevTools
Working on the front end means you are often going to use a browser. Google Chrome is the most used web browser. It is very popular among frontend developers because of its DevTools. These tools are very useful in various ways, most importantly, for debugging.
Then comes testing and debugging. A frontend developer should know how to test and debug the code. Other important skills are version control systems such as git and Chrome DevTools.