High light is best for these cacti, and they will do well in direct sunlight
Cacti require little water and the soil should be allowed to dry out between watering. Water a little more frequently if you see flower buds emerging.
A weak solution of fertilizer can be added to the water. Specialist cactus fertilizers are available, but they are quite expensive.
Generally pest free, but the occasional mealybug might be found. These should be removed with a pair of tweezers, or a stiff paintbrush, if seen