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The latest version of the ECMAScript standard is referred to as ES2022. However, there are almost always something new cooking, which you can use (ESNext) if yo have a javascript engine that implements it, or if you use a polyfill which implements some particular feature for earlier javascript engines.
If you're just learning JavaScript, don't worry too much about this stuff. The usual version related problem is that a script written in newer javascript syntax will fail on older browsers that haven't been kept updated. In this case it's possible to automatically convert your new syntax script to an older version (see Babel).