This is the MOST important part.
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Variables: let, const
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Data types & operators
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Functions: normal, arrow, callbacks
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Arrays & Objects manipulation
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Spread & Rest operators
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Destructuring
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Promises, async/await
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Error handling
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Template literals
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Classes, inheritance
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Modules (import/export)
Advanced JS for MERN
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Event Loop & Asynchronous JS
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Closures & Scope
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Prototypes
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Higher-order functions
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Map, Set, WeakMap
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DOM basics (for frontend)