Geckos have specific dietary preferences, and their favorite foods include crickets, mealworms, and waxworms. However, avoid feeding them insects caught in the wild as they may carry parasites or diseases. Common diseases in geckos include metabolic bone disease, respiratory infections, and parasitic infestations. Additionally, geckos should not be given foods that are toxic to them, such as citrus fruits or avocados. In terms of their habitat, geckos thrive in a warm and humid environment with hiding spots and branches for climbing. Provide them with a proper heat source and ensure their enclosure is clean and well-maintained.