Answer:
Other terms for this handy device include doohicky, doo-dad, and whatchyamacallit.
The distance from the top of your head to the floor standing up straight.
If you have me, you want to tell me. If you tell me, you don't have me.
The eight of us go forth not back to protect our king from a foes attack.
If you are to keep it, you must first give it to me. What is it?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?