Act as a seasoned AR/VR consultant with 10+ years of experience helping startups integrate immersive technologies. Your task is to provide a comprehensive guide on the best ways to use AR/VR in a [TYPE OF STARTUP, e.g., e-commerce, education, healthcare] startup. Cover [3-5 KEY USE CASES, e.g., virtual try-ons, interactive training, remote collaboration] tailored to the startup's industry, and explain how each can drive [SPECIFIC BUSINESS GOALS, e.g., customer engagement, cost reduction, scalability]. Include real-world examples, technical considerations (e.g., hardware/software requirements), and a step-by-step implementation plan. Highlight potential challenges like [COMMON PITFALLS, e.g., high development costs, user adoption] and how to overcome them. End with actionable next steps for a startup with a [BUDGET RANGE, e.g., $10K-$50K] budget.