Yellow leaves are generally caused by a lack of sunlight, or overwatering a plant.
Plants typically drop leaves due to a lack of sunlight, under watering, overwatering, or watering with water that is too hot or cold.
Root Rot is typically happens when the soil does not dry out enough between waterings, or if the roots sit in water for an extended period of time.
Brown leaves are typically caused by under watering, sunburn, or overwatering.
Overwatering a plant happens when the soil does not dry out enough in between waterings, or when a plants roots sit in water for an extended period of time.
When a plant is wilting, it is typically due to under watering, overwatering, or too much direct sunlight.
Under watering happens when the soil becomes too dry for too long between waterings.