every other watering with soil with synthetics. some organic nutes can be watered every time like earth juice. my favorite for soil at least! if your new at start at 1/2 strength. your plant will tell you if you need to add more. some strains grow better with less fertilizer. and each strain is different unfortunately or else there would a super recipe that everyone would use. Ventilation and humidity also make the difference in the world!
When you water, water until water starts flowing out of the bottom of the container.