This tutorial explores the principles of effective user interface (UI) design tailored explicitly for decentralized applications (dApps) on the Celo blockchain. It emphasizes the importance of creating visually appealing and user-friendly interfaces. The tutorial covers fundamental principles such as simplicity, consistency, and clarity in UI design. We will introduce KISS (Keep It Simple Stupid), Fitts’s Law, Hick’s Law, and Gestalt Principles, It delves into the significance of responsive design to ensure seamless experiences across different devices. It also explores the use of appropriate colors, typography, and visual elements that align with the brand identity and enhance usability. Furthermore, the tutorial discusses the importance of designing intuitive navigation and ensuring the accessibility of the dApp. By understanding the principles of effective UI design for decentralized Celo applications, learners will be equipped to create interfaces that captivate users, facilitate seamless interactions, and enhance the overall user experience on the Celo blockchain.