Sunlight: Again, these guys have plump leaves that hold water like succulents do, so they need lots of sun. Place Hoya in a very bright window with 6+ hours of daily sun. Low light = sad Hoya.
Watering: Water when the pot feels dry. If you have a moisture meter you can test that way, or go by feel. When the pot is light, gently aerate the soil and water throughly. Never let these stand in water.
Humidity: Hoya like some humidity over dry air.
Soil: For Hoya, A mix of an orchid bark, perlite, sand, and soil mixture. This keeps the soil well-draining so when it’s watering time, there’s not a root rot risk.