The key elements to include in a startup pitch deck are a compelling problem statement, a unique solution, a market analysis, a competitive analysis, a clear business model, a demonstration of traction or potential, a strong team introduction, and a well-defined ask. To effectively design and present your pitch deck, it is important to keep it concise, visually appealing, and easy to understand. Use clear and impactful visuals, limit the amount of text on each slide, and practice your presentation to ensure a confident and engaging delivery.