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You want to ensure your hands are completely clean before you sit down for your meal. In Indian culture, the left hand is commonly viewed as dirty and unsanitary, and therefore rude to eat with. Avoid serving, eating, or touching any of the food with your left hand. Avoid letting the food touch your palms. Hold the food near the tips of your fingers when you're bringing it to your mouth. It's custom to sample each dish individually. This goes for any main dishes and side dishes but does not include the bread, rice, or daal. For example, you wouldn't mix a vegetable dish with a meat dish in the same bite, or eat one of the side dishes with one of the main dishes in the same bite.
Wash your hands before you eat. Eat with your right hand only. Use only your fingers to pick up food. Take bites of one dish at a time.