Heading: Master JavaScript: From Variables to Async Programming

**Prompt:** Explain JavaScript concepts such as variables, scope, hoisting, closures, objects, promises, async/await, and the event loop in simple words. Describe what each concept does, why it is useful, and when to use it, with short code examples and expected outputs.

https://www.debug.school/rakeshdevcotocus_468/javascript-concepts-every-developer-should-know-what-why-when-where-and-how-587f