The medium should be kept moist. Most will be damaged by wet medium but some can tolerate or even thrive in a wet medium. High humidity in the air leads to more attractive foliage. Low to moderate light. Most will burn in bright light, but will be less colorful in low light.
Moderate light is usually best since it gives good color without risk of burning.
The aroids respond to fertilizer. Large leaves are the result of ample fertilizer. A fertilizer higher in nitrogen than phosphorus and potassium is common. Diseases are uncommon, but bacterial rot can affect some if they are kept very warm and humid or are stressed by cool temperatures. Remove spent leaves and flowers.