HTTP is a request-response protocol for transferring data over the internet, allowing clients and servers to communicate independently. It has four main request methods: GET, POST, PUT, and DELETE, with servers responding with status codes indicating the outcome of the request. Understanding HTTP protocols and status codes is crucial for building robust and scalable web applications.

RESTful APIs allow different systems to communicate over the internet, characterized by being resource-based, client-server, stateless, cacheable, and having a uniform interface, aiming to make web services scalable, flexible, and maintainable.

A comprehensive guide to full stack careers: outlines front-end, back-end, and full stack tracks with progression, and high-value specializations in mobile, DevOps/cloud, AI/ML, cybersecurity, and accessibility; emphasizes adaptability and continuous learning, and illustrates via a DevOps pivot case study how targeted upskilling can open roles, boost impact, and increase pay.

Accessibility ensures products can be used by people with disabilities, injuries, or age-related limitations. Key principles include making content perceivable, operable, understandable, and robust. Techniques include using semantic HTML, alternative text for images, keyboard-navigable components, sufficient color contrast, and screen reader-friendly JavaScript to create more inclusive applications.

HTML and CSS form the backbone of every website, application, and online experience. HTML provides structure and content using tags to define elements, while CSS enhances visual presentation with rules targeting specific HTML elements, defining properties and values for layout, color, and more.

WebAssembly (WASM) compiles C/C++/Rust and more into a secure, platform-agnostic binary that runs near-native in browsers and runtimes, eliminating JS interpretation/JIT overhead and cutting startup time. It excels at CPU-intensive tasks, ML/AI, and console-grade graphics, and lets teams mix languages with JS. Adoption is simple: compile modules and call them from JS - ideal for speeding simulations, compression, crypto, or real-time product recommendations.