What are the most useful websites you have ever come across?

Wikipedia (wikipedia.org): This online encyclopedia provides a vast collection of knowledge on various subjects. It serves as an excellent starting point for research and offers a comprehensive overview of countless topics. Khan Academy (khanacademy.org): Khan Academy offers a free and extensive educational platform that covers subjects such as math, science, history, and more. It provides video lessons, practice exercises, and educational resources, making it a valuable learning tool for students of all ages. TED (ted.com): TED is a platform that hosts inspiring and informative talks by experts in diverse fields. From science and technology to art and personal development, TED talks provide valuable insights and perspectives on a wide range of topics. Stack Overflow (stackoverflow.com): Stack Overflow is a community-driven Q&A platform specifically focused on programming and software development. It serves as a go-to resource for programmers seeking solutions to technical problems and offers a vast repository of coding knowledge. Coursera (coursera.org): Coursera is an online learning platform that offers courses and specializations from top universities and institutions worldwide. It covers a wide range of subjects and provides the opportunity to learn new skills or enhance existing ones through flexible online courses. Duolingo (duolingo.com): Duolingo is a language-learning platform that offers interactive lessons and gamified exercises to help users learn languages effectively. It provides a fun and engaging way to learn languages at your own pace. Google Drive (drive.google.com): Google Drive offers cloud storage and file synchronization services. It allows users to store, share, and collaborate on documents, spreadsheets, presentations, and more. With its accessibility and collaboration features, Google Drive is a valuable productivity tool. Canva (canva.com): Canva is a web-based graphic design tool that enables users to create professional-looking designs and visuals without prior design experience. It offers a wide range of templates, stock photos, and intuitive editing tools, making it useful for both personal and professional projects. Reddit (reddit.com): Reddit is a social news aggregation, web content rating, and discussion platform. With numerous communities (subreddits) covering diverse topics, it serves as a valuable source for news, entertainment, discussions, and niche interests. Evernote (evernote.com): Evernote is a note-taking and organization tool that allows users to capture ideas, create to-do lists, and save important information across devices. Its features include text recognition, file attachments, and easy synchronization, making it a valuable tool for personal and professional use.