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I really always hate to see folks being snippy in their answers, I apologize for the answers you got so far.
The core differences are:
Java: The essential tools for any Java developer, including a Java IDE, a Git client, XML Editor, Mylyn, Maven and Gradle integration
Web/JavaScript: The essential tools for any JavaScript developer, including JavaScript, TypeScript, HTML, CSS, XML, Yaml, Markdown... languages support; Kubernetes, Angular and React frameworks support; Node.js debugger; Git client; Mylyn task management; integrated terminal and remote filesystem explorer; Web and application server management.
At the end of the day its all about which packages come pre-installed. You can choose to start with one and then add the packages you want from the other. To see which specific pages are installed with either go here:
Java: https://www.eclipse.org/downloads/packages/release/2019-09/r/eclipse-ide-java-developers
Web/JavaScript: https://www.eclipse.org/downloads/packages/release/2019-09/r/eclipse-ide-web-and-javascript-developers-includes-incubating-components
As the Eclipse site clearly shows, the different versions contain different modules; in this case one has modules for JS and Web development, the other for Java EE development. Just download the version that has all the modules.
Currently learning core Java and using Eclipse and it's great.
In the next few weeks going to start JavaScript/HTML/CSS and was wondering if I can do all of this with Eclipse?