Lighting

Most orchids prefer low lighting, such as an east-facing or shaded window. Your plant will tell you if it’s getting too much (or too little) light. Leaves tend to become greener when light is too low, but they may turn yellow or bleached-looking when light is too bright. If you notice black or brown patches, the plant is likely sunburned and should be moved to an area with lower light.

Watering

Overwatering is the prime cause of orchid death, and orchid pros advise that if in doubt, don’t water until the top couple of inches (5 cm.) of potting mix feel dry to the touch.

Repotting

Repot orchids into fresh potting mix every couple of years. Use a potting mix formulated for orchids and avoid regular potting soil.

Read more at Gardening Know How: Beginner Orchid Growing: Getting Started With Orchid Plants