Answer:
A squiggly line tells you when you've done it wrong
What Can Fly Without Wings
You have it even if there is none.
Some keep it in a dumpster while others keep it in their trunk.
Sometimes it's silver but also gold. Printed on paper it's a treasure to hold. What is it?
I am a rock group with four members. All dead one was assassinated.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?