Basil growing indoors requires at least 6 hours of south sunlight. Otherwise, basil plants can be grown under 10 hours of fluorescent lights for healthy growth.
The soil should be kept somewhat moist, but never be soggy; otherwise, the roots will be prone to rotting.
The balance between light and watering is the key to growing your fresh herbs. If a pot feels light, the soil is probably dry and need watering.