Answer:
I have no head and a tail I lack but I do have arms and legs and back; I inhabit the palace the tavern the cot 'tis a beggarly residence where I am not. If a monarch were present (I tell you no fable) I still should be placed at the head of the table.
you can throw me away but I will always be coming back
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
Lighter than what I am made of, more of me is hidden than is seen. What am I?
What gets sharper the more you use it?
How do you know if a sniper likes you?