Lessons
The following lessons explain different programming concepts and have been published by our members. Search for a particular lesson using the filters
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Learn how to use browser developer tools to observe, analyze, and troubleshoot HTTP requests made by JavaScript. This lesson teaches you how to interpret errors, understand response times, and improve API interactions.
Explore how the browser manages resources referenced in an HTML page (like stylesheets, images, and scripts). Learn what loads first, what can block rendering, and how to optimize the delivery of visual content.
Discover how web servers interpret a URL's path to deliver the correct resource. This lesson explains server request routing with a clear analogy and diagrams to visualize the process.
Learn how to use useMemo to memoize expensive computations, prevent unnecessary recalculations, and boost your React application's performance.
Explore popular form libraries like Formik, React Hook Form, and Yup for streamlining form handling in React applications, reducing boilerplate code, and simplifying validation.
Master controlled components in React forms, learn effective state management patterns, and build forms that provide real-time feedback and validation for an enhanced user experience.
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Discover how JavaScript can update parts of a web page in real-time without reloading the entire page. This lesson explains how dynamic HTTP requests work and how modern websites use APIs to fetch new data.
Discover how the browser interprets the HTML received from the server to construct the visual structure of a web page. This lesson explains how the DOM is formed, what blocks its parsing, and why this step is crucial in loading any website.
Learn how the Domain Name System (DNS) translates easy-to-remember domain names into IP addresses that servers understand. This lesson explores how DNS works and why it is essential for web navigation.
Learn how to use the useRef hook to directly access DOM elements, store persistent values across renders, and build more efficient React components.
Learn when and how to implement uncontrolled components in React forms, understand their benefits for simplicity and performance, and see how to use refs to access form values.
Learn how to handle forms in React applications, understand the key concepts of controlled and uncontrolled components, and implement basic form handling techniques.
Learn how WebSockets work to achieve real-time updates between client and server. This lesson explains how a persistent connection is established, its advantages over traditional HTTP requests, and everyday examples that use this technology.
Learn how browsers optimize web page loading using cache and other key techniques. This lesson explains how caching works, when it can cause issues, and how to leverage it to improve user experience.
Discover what happens inside the server after receiving a request: how it generates content, adds headers and status codes, and responds to the browser. This lesson combines the logic of processing and delivering web responses into a single pedagogical flow.
Learn how to optimize component rendering by memoizing callback functions with useCallback, preventing unnecessary re-renders and improving React application performance.
Learn how to create your own custom React hooks to abstract and share stateful logic between components, improving code reusability and maintainability.
Learn how to implement effective form validation in React applications, from basic client-side validation to advanced validation libraries and techniques for providing user feedback.