The Gray lady who is the daughter if Helena Ravenclaw.
A lost crown that once belonged to Helena Ravenclaw. Her daughter, the Grey Lady, stole it and took it to Albania where is was considered lost. Lord Voldemort discovered it, turned it into a Horcrux and hid it inside the Room of Requirement at Hogwarts. He hid it inside the room when it was turned into a place to hide things, Harry Potter hid the Half-Blood Prince potion book in there the year before so he knew what it was. Voldemort thought nobody else would ever come across the room.
The ghost tells Hamlet not to bother his mother.
Nobody knows, the book only tells us that Godric Gryffindor came up with the idea to bewitch the hat to sort students into the houses once he, Ravenclaw, Hufflepuff, and Slytherin all died.
a ghost board learns you how to talk to a ghost. you ask the board something you type it and it tells you how to say it. for example you asked the board how to tell a ghost wanna be friends and it tells you. that board will help you talk to a ghost. so buy that board and keep learning until you know how to speak to a ghost.
"The clarity of the diamond tells you how clear the diamond is"
Dobby the house-elf told Harry about it .
No she didnt....Dumbledore tells Harry that he is a Horcrux
tells brutus that they will met at
You go to the lakes he tells you to.
Harry was at Shell Cottage i think when Remus tells him of his new born son. Hope this helps!!
The holy ghost is basically like a conscience, the little voice in you that tells what's right and wrong
No.