He became a nightmare - inducing killer because he was killed in a horrible way - burned alive. And after that, he somehow got the power to enter people's dreams and kill them there.
Well, first of all, Freddy Krueger was a heinous child killer. When the parents finally caught up with him and set him on fire, his death was extremely violent. This violent death, combined with his already evil nature, seems to have given him the ability to cross over into the dream realm. Once in the dream world, he can use the power of people's subconscious fears against them. His appearance, which is a grotesque result of his burning, and his weapon - the bladed glove - are all part of what makes him so terrifying. He's able to play on people's nightmares and turn them into his own killing ground, which is how he became the nightmare - inducing killer in his origin story.
He became a nightmare - inducing figure because of his heinous crimes. He was a murderer of children, and his return from the dead to haunt dreams was terrifying.
After being killed by the angry parents, Freddy Krueger's malevolent spirit found a way to exist in the dream world. His horrible death and his already evil nature made him a perfect candidate to become a nightmare figure. His presence in the dream world is a form of revenge against those who killed him and also a way to continue his killing spree in a different realm.
Freddy Krueger became part of the original story as a result of his cruel and immoral actions. He was a killer of children, which was an unforgivable crime in the eyes of the community. When the enraged parents burned him alive, they thought they had ended his reign of terror. But his return as a figure that could invade people's dreams and kill them there was a new and terrifying concept. This concept was what made him a key part of the original story. His presence in the dreams, with his menacing appearance and his sadistic ways of killing, created a horror story that has been told and retold many times.
Freddy's origin story is quite dark. He was a disfigured murderer who was burned alive by a mob of angry parents. But his evil spirit persisted and found a way to terrorize people in their dreams.
Freddy Krueger was a child murderer. He was burned alive by the parents of the children he had killed. After his death, he came back in the dreams of people in Springwood to continue his reign of terror.
Freddy Krueger was a child murderer. He was burned alive by the parents of the children he had killed. After his death, he came back in the dreams of his victims as a way to continue his reign of terror.
Freddy Krueger was a child killer in the town of Springwood. He was burned alive by the angry parents of his victims. After his death, he became a nightmare - dwelling entity. He uses his bladed glove to kill people in their dreams, and if they die in their dreams, they die in real life too.
Freddy Krueger was a child killer in the town of Springwood. He was caught but released on a technicality. The angry parents of his victims took matters into their own hands and burned him alive in the boiler room where he used to take his victims. But Freddy made a deal with some dark forces and came back as a dream - demon, able to enter people's dreams and kill them in their sleep.
Freddy Krueger was a child murderer in the story. He was burned alive by the parents of the children he killed. Then he came back in dreams to haunt and kill people, using his bladed glove as a weapon.
In the comic, Freddy Krueger met his end in a quite dramatic and unexpected way. But I can't spill all the details here. You'll have to read it to find out!