How can I create a suitable environment for a snail in a terrarium?

To create a suitable environment for a snail in a terrarium, you should provide a moist substrate, such as coconut coir or peat moss, to maintain humidity. Include hiding spots like rocks or logs for the snail to feel secure. Ensure the terrarium has proper ventilation and a source of calcium, like cuttlebone, for the snail's shell health. Keep the terrarium at a moderate temperature and avoid direct sunlight to prevent overheating. Regularly mist the terrarium to maintain humidity levels.