This beginner's guide provides a comprehensive overview of Web3 technology, a decentralized internet built on blockchain that empowers users with complete control over their data and digital assets. The article explores Web3's core concepts including decentralization, trustless environments, semantic web integration, and interoperability, explaining how these principles work through blockchain, smart contracts, and digital wallets. Key technologies driving Web3 development include tokenization, WebAssembly, and semantic web technology, each enhancing performance and functionality. Beyond technical foundations, the guide details significant benefits such as personal data control, transparency, seamless data assurance, and advanced data processing capabilities. However, challenges like device requirements, scalability issues, and steep learning curves require attention. Through practical applications including smart contracts, decentralized identity systems, and IPFS infrastructure, Web3 demonstrates transforma