There are a variety of myths out there about whales, ranging from them blowing water from their blowholes to swallowing humans. However, most of these are wrong.
Whales have hair: Though they don't look furry, whales actually have hair, and some are even born with whiskers that fall out because they serve no purpose underwater. Hair follicles are an evolutionary trait present in all whales since whales are mammals.
Whales can't breathe underwater: Whales have lungs just like we do, and need to breathe in order to survive (though they do last much longer on one breath than we do). Their blowhole(s) are like our noses.
Whales expel air from their blowholes: Whales breathe, and their blowholes serve as an air intake. When they surface, they blow air out, and the hot air from their lungs condenses when it collides with cold air outside. Water and other particles that were covering the blowhole are also expelled.
Not all whales sing: You've probably heard about whale songs - predictable sequences of sound that travel through the ocean. However, only certain baleen whales exhibit this behavior. Toothed whales use echolocation, which emits high-pitched clicks to identify objects.
Whale sharks are not a type of whale: While whale sharks might be called whales and grow as large as one, they are a type of fish, not a mammal. Like all sharks, they are cold-blooded, have gills, and have a skeletal system comprised of cartilage. In addition, their fins move side to side, rather than up and down.
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