Start by assessing your current knowledge in front-end and back-end technologies. If you're a beginner, consider more straightforward projects like a personal portfolio website or a basic CRUD (Create, Read, Update, Delete) application. Intermediate developers can tackle more complex applications like a small e-commerce site or a simple social media platform. Advanced developers might focus on projects integrating advanced features, such as real-time communication or using AI and machine learning models. Choose a project that stretches your abilities slightly beyond your comfort zone to ensure growth.