Master Table of Contents Who this chapter is for What you’ll learn Why this topic matters Most React bugs are actually JavaScript logic bugs in disguise. If your basics are shaky, everything feels harder: state updates, rendering conditions, and debugging. This chapter helps you think clearly before touching more advanced patterns. Core concepts Variables and scope Quick reality check: Conditionals…

Master Table of Contents Who this chapter is for What you’ll learn Why this topic matters Most frontend work is not “building buttons.” It is transforming data cleanly. If your data handling is messy, your UI logic becomes fragile fast. When this skill is solid, React feels much easier because your components receive cleaner, predictable data. Core concepts Array methods…

Master Table of Contents Who this chapter is for What you’ll learn Why this topic matters As projects grow, “one big file” quickly becomes a nightmare. Modern syntax helps reduce repetitive code, and modules keep logic separated so your app can scale without becoming chaotic. In real teams, readability and structure matter as much as code that “just runs.” Core…

Master Table of Contents Who this chapter is for What you’ll learn Why this topic matters React makes UI development faster, but browser behavior is still the foundation. When things break (double submit, stale input, weird event behavior), debugging gets much easier if you understand native DOM flow first. This chapter gives you the “under the hood” mental model before…

Master Table of Contents Who this chapter is for What you’ll learn Why this topic matters In real apps, almost everything important is async: API requests, file uploads, auth checks, search suggestions. If async flow is unclear, your app feels buggy even when the code “looks fine.” When async fundamentals are solid, you avoid the classic pain: stale data, flickering…

Master Table of Contents Who this chapter is for What you’ll learn Why this topic matters React is not just a library syntax; it is a UI architecture style. Once you understand components, props, and state clearly, building bigger interfaces becomes way more manageable. If these fundamentals are shaky, later topics like hooks, routing, and state management will feel confusing….