India is massive, making transit planning crucial.

The Railways: The Indian railway network is an experience in itself. For longer journeys (like Delhi to Varanasi), book AC classes (1AC, 2AC, or 3AC) well in advance via the IRCTC portal for comfort and security.
Flights: For long inter-state jumps (e.g., Rajasthan to Kerala), rely on India's robust domestic airline network, including IndiGo, Air India, and Vistara, which offer fast and incredibly affordable connections.

To keep your stomach happy and avoid the dreaded "Delhi Belly," adhere strictly to a few golden rules: Never drink tap water. Stick exclusively to sealed, branded bottled water, even for brushing your teeth. Avoid ice in your drinks unless you are at a high-end luxury hotel. When eating, focus on food that is cooked to order and served piping hot. Avoid raw salads or unpeeled fruits from street vendors.

India is a deeply conservative and spiritual country. Dress modestly—both men and women should cover their shoulders and knees, especially outside of beach destinations like Goa. When entering temples, mosques, or local homes, you must remove your shoes. Prepare mentally for dense crowds, loud street noise, and a different concept of personal space; remaining patient and greeting locals with a polite "Namaste" (palms pressed together) will open many doors.