ES6 refers to ECMAScript 6, and its standard characteristics are governed by ECMA. It offers features such as classes, modules, arrow functions, template literals, destructuring assignments, and much more to facilitate easy working with JavaScript.
Udemy has, by default, English language subtitles during the course, but if you wish to change the language, you can explore settings to change language subtitles.
JavaScript was created by Netscape. To avoid a trademark issue, Microsoft changed the name to JScript. In other words, JScript is similar to JavaScript, except Microsoft provides it.
Yes, JavaScript is a case-sensitive language; it means you must write the language keywords, variables, function names, and other identifiers in capital letters. Otherwise, it might cause an error in your code.
First, you must complete the course 100% to get the certification. The certificate can be achieved by clicking on the "Your progress' in the top right-hand corner of the course page once you've finished the course. In case of any issues, contact the Udemy support team.