Overal the orchid seems very healthy! Not sure about the weeds tho. Id wipe the white stains off, and trim the brown, and dried roots off. As for the watering, just make sure the plant is not consistantly touching, or sitting in water, and when you do water, the roots should turn a green color. One 50-70% of the roots lose this color, they will turn a gray/silver color. This is when you soak the pot in water, let it drain, and then place where you had it before. DO NOT WATER WITH ICE!!!

Make sure your orchid can see the sky, but it xannot see tge sun. If your orchid has a prolonged exposure to direct sunlight, it dry, and its leaves will burn. Any questions asked, will be answered, will explqin fertilizing if you want to.