I recommend Visual Studio Code. It starts out simple, so there isn't a lot to learn before you can get started working on code. Just install it and open up a file. As you learn more about what you're working with, it has a ton of extensions and is easily customized via JSON files which can be used globally or per-project. It's actually completely replaced bulkier IDEs for me, just through extensions and customization, but is still useful for quick edits on small files. It runs on Windows, OS X, or Linux. The built-in code tooling is pretty helpful, and it has a built-in terminal window so you can stay within the application as you work.
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