Learn the Basics
First, you will need to learn the basics of the language. However, most projects (whether in Node or on the front end) require you to have at minimum a familiarity with (and, more often than not, expertise with) the other major building blocks of web pages: HTML and CSS.
The various specialties within front end development. Source: SlideShare.net.
Learn the Web Browsers and the Console
When it comes to developing on the front end, it is essential to know how to test in all of the web browsers that may need to be supported for a given project. This could include not only the latest version of any given browser (e.g., Chrome, Firefox, IE, Safari), but may also include older versions that may require additional testing or workarounds to make things work.
With this, it is helpful to know how to use the developer tools/consoles that come with each browser, so that you can identify and debug problems more quickly when they arise.
Example of a web browser console. Source: Mozilla.
Learn Related Libraries and Technology
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