In short
Arithmetic, comparison, logical and assignment operators (`+`, `===`, `&&`, `??`, `?.`) — including JS-specific quirks like `==` vs `===` coercion. These operators are small but powerful building blocks for control flow, safe property access, defaults, comparisons, and concise data handling.
How to learn this
- 1Test `==` vs `===` on a few tricky pairs (e.g. `0 == false`, `null == undefined`). Validate your understanding by applying it in a small practical example.
- 2Practice the nullish coalescing (`??`) and optional chaining (`?.`) operators. Test it with at least one normal case and one edge case so you can explain the behavior confidently.
- 3Default to `===`/`!==` unless you have a specific reason not to.
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