Not very. Much of what modern viewers think of as "traditional werewolf lore" was invented by Hollywood. In real traditional folklore, werewolves were made by being cursed or (more often) deliberately making a pact with the devil. Werewolves changed into regular wolves, could change at will, and were mortal and could be killed by conventional means.
The notions that one became a werewolf by a bite, and changed involuntarily when the moon was full, were invented by an earlier werewolf movie, 1935's "Werewolf of London," a box-office flop at the time, but now regarded as a minor classic. That movie was also the first to feature a bipedal wolf-man creature, probably done partly to avoid having to use a trained wolf or similar, and for dramatic effect. "The Wolf Man" screenwriter Curt Siodmak created the plot element of a silver bullet being the only thing that can kill a werewolf, and werewolves being repulsed by wolfsbane. Later films would invent the detail that werewolves are immortal, as a way of justifying bringing the character back for multiple sequels, and also adding other (fictional) details for dramatic effect.
Eventually, these ideas became so prevalent in pop culture that they are now mistaken for real, traditional folklore.