W3Schools

W3Schools is a website that provides free online tutorials, references, and exercises in all major web languages including Java. The website gradually develops Java into a popular programming language with a reasonable teaching method.

W3Schools guides you from scratch with simple examples and guides you to professional references. W3Schools as a reference rather than a primary learning resource. Java is used in W3Schools to develop mobile apps, web apps, desktop apps, games, and more. W3Schools allows Java to work on different platforms (Windows, Mac, Linux, etc.)

Pros:

• Provides basic tutorials for your reference that better Java practice.
• The website interface is easy to use and friendly.

Cons:

• Only provide simple articles, so it's only for reference, not for learning to improve knowledge.

Website: https://www.w3schools.com/java/