Lily Luna Potter, Harry's daughter, would have grown up knowing because all her family would be magical.
Lily Evans, Harry's mother, was told by Severus Snape and it was confirmed by her Hogwarts letter. Somebody would have come and explained it to her parents like Hagrid did with Harry (only they thought he knew).
Hagrid told him he was a wizard.
the snake at the zoo is one of them. he accidently removed the glass that dudley was leaning on that made him fall into a snakes cage. the snake slithered away after telling harry "thanks" and harry replaced the glass that trapped dudly.
Albus Dumbledore.
Witch and wizard trading cards came with the chocolate frogs.
A horcrux is a magical device which contains a portion of a wizard's soul.
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no one. Havrid told Harry he was a wizard before they left.
Harry Potter is told he is a wizard by Rubeus Hagrid, Keeper of Keys at Hogwarts in Chapter 2.
Hagrid told him he was a wizard.
Harry Potter (the first one) is all about Harry finding out that he is a Wizard and going to Hogwarts and fighting Voldemort (the darkest wizard ever) for the first time. When Harry was a baby his parents were killed by Voldemort and he tried to kill Harry, but couldn't because their parents gave up their lives for Harry. Harry is the only wizard ever to survive the killing curse, and so he is the most famous wizard in the wizard world and Harry has to get used to that.
A wizard
The Wizard Card's come from Chocolate Frogs. The first one Harry ever got was Dumbledore.
Among the many facts that Harry Potter learned from Rubeus Hagrid are that Harry is a wizard and that his parents were not killed in a car crash, but murdered by Lord Voldemort. Throughout his years at Hogwarts, Harry learns others things from Hagrid who becomes his Care of Magical Creatures professor for three years.
A half-giant named Hagrid breaks into a house where Harry and his aunt, uncle, and cousin are hiding. Hagrid gives Harry a smashed birthday cake, tells him he's a wizard, invites him to the wizard school, Hogwarts, gives Harry's cousin a pig's tail, and takes Harry away to get him ready for school.
That he was a wizard and that he can talk to snakes.
Harry Potter discovered that his parents were a witch and wizard and that they were murdered by Lord Voldemort. Harry had always been told that his parents died in a car crash and he had no idea they were magical.
The person who takes Harry from the Dursleys, was Hagrid.