Water your fig tree when only the top inch of soil is dry. Test this by sticking your finger in the soil. Pretty soon you’ll figure out about how often you need to water. Keep in mind that this may fluctuate based on seasonal humidity, etc.
Keep your fiddle leaf fig in bright, indirect light. In other words, you want it to have a lot of light, but not sunbeams falling directly on it.
Fertilize once a month during growing seasons, but not in winter.