The same way you would take care of an outdoor one. Mind the light, temperature, and water, but in a slightly different way. Because you no longer have to rely on sunlight, you must utilize strong grow lights for your garden.
Maintain a healthy temperature between 65 and 70 degrees. Herbs thrive in warmer climates. You must also ensure that the pH level of your water is at 6. Before you add any nutrient solution to your water, you must first check the pH level using your pH meter. Use the meter to regulate the pH level when needed.