Answer:
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I’ve told you all I cannot tell you more.
I am the word that has three syllables and twenty six letters.
You use a knife to slice my head and weep beside me when I am dead.
I am an instrument you can hear but cannot touch or see. What am I?
Long and thin red within with a nail at the end.
Give it food and it will live, give it water and it will die.