"Explore our structured learning paths to discover everything you need to know about building for the modern web." - Google

Some content is free; majority comes with small fee. Considered a great place to learn how to code and think like a coder. Codecademy is similar, though considered more superficial in its coding lessons.

Great starting point for beginners, though considered less reputable by experienced developers for coding beyond the basics.

Considered robust and more reliable than W3Schools by developers; good for code references.

Originally focused exclusively on CSS, now is "a site about all things web design and development". Easy to follow, use, and fairly authoritative.

"Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. " -stackoverflow.com. Consistently ranking at the top of Google Results, it is a go-to place to learn how to accomplish certain front-end development tasks.

The International Community that publishes the standards for the World Wide Web. See also the Web Platform Docs, supported by the W3C, as a repository for authoritative documentation in web standards and practices.

From Google Developers

For pure javaScript solutions to problems

Free online computer science courses

A free guide to all HTML attributes and elements.

Acclaimed coding instructor, Wes Bos, presents "a fun, exercise heavy approach to learning
Modern JavaScript from scratch"

"CodePen is a playground for the front end web." - Codepen. Used by many web developers and consistently ranked at the top of "sandbox-like" web tools. Similar tools that are helpful include: jsFiddle and JS Bin.

"'Can I use' provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers." - Caniuse.com.

Automatically converts your CSS to add prefixes where needed, and minimizes your code as well. Highly recommended by the web development community.

To open: Right-click on page element and select "Inspect" (in Chrome) / "Inspect Element" (in FF).

The most popular text editor used today (and my personal favorite) is Window's Visual Studio Code. Another editor used by a number of coders is Notepad++.

A very popular tool to save, collaborate, and share code.