Basic Web App Development ihhh ko

I need a straightforward, responsive web application built from scratch. At this stage the concept is open-ended, so I am counting on your guidance to shape the tech stack, folder structure, and initial modules while keeping the codebase clean and easy to extend later... (Budget: $250 - $750 USD, Jobs: CSS, Frontend Development, HTML, HTML5, JavaScript, Svelte, Vue.js, Web Development)