Decentralized applications (dApps) operate without relying on centralized servers, utilizing blockchain and oracle technologies to maintain secure and tamper-proof backends. This tutorial guides users through developing an end-to-end dApp, where users can access and store the current ETH price using a smart contract. Unlike traditional apps, dApps' backend logic is executed on blockchains, offering advantages such as enhanced privacy, resilience against manipulation, and execution in low-trust environments. However, these benefits come with challenges, including maintenance difficulties, lower performance, and a less streamlined user experience due to the need for Web3 wallets and transaction fees. The tutorial details the dApp's components: smart contracts for business logic, a frontend UI developed with standard web technologies like React and Ether.js, and data storage using distributed services such as IPFS to manage costs and efficiency. The process involves creating a smart contract with Chainlink data feeds, deploying it on the Rinkeby test network, and developing a React-based frontend to interact with the contract, culminating in a functional dApp that combines blockchain security with a user-friendly interface.