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useState is the right default. But when state updates depend on each other or your update logic gets complex, useReducer is the better tool.

Most engineers spend a lot of time writing code and very little time making it easy to review. A well-written PR gets merged faster and builds trust with your team.

Cache-Control, ETag, Last-Modified, these headers can make your app dramatically faster or subtly broken. Here's how to use them correctly.

async/await is syntax sugar over Promises, which are built on the event loop. Understanding the full stack makes async code far less mysterious.

z-index is not global. Stacking contexts create isolated z-index scopes, which is why your modal ends up under the sidebar.