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Explore var/let/const scoping, primitive types, type coercion, TDZ, and falsy values.

Master closures, hoisting, arrow functions, call/apply/bind, IIFE, and currying.

Arrays, objects, destructuring, spread, Map, Set, WeakMap, and the prototype chain.

Event loop, callbacks, Promises, async/await, Promise.all/race/allSettled, and fetch.

DOM manipulation, event handling, bubbling, delegation, MutationObserver, and Web APIs.

Template literals, classes, modules, Set/Map, Proxy, Symbol.iterator, and logical assignment.