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The design phase is a crucial step in Web App Development that involves planning the overall look, feel and functionality of the application. 

Front-end development of a web app involves creating the User Interface (UI) and User Experience (UX) that users interact with their web browsers. It focuses on the visual elements, layout and interactivity of a web application. Build this using HTML, CSS, and JavaScript and front-end frameworks like React, Angular or Vue.js.