How to write,declare a javascript?

In this video, we are going to cover
Introduction of JavaScript
1. How to write JavaScript statement?
2. How to write comment in JavaScript?
3. How to declare a variable in JavaScipt?
4. How to show an alert to the user in JavaScript?
Where and how to keep JavaScript code?
5. Inside HTML Page -- How to write JavaScript code in the html page?
6. How to prevent JavaScript tag showing up in case a browser doesn't support JavaScript?
7. Where to keep JavaScript code in HTML page?
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