Answer:
They keep secrets locked away. And you pass through them each day. For each one there is a key, They respond to sesame.
It covers you, you lose it every day and you'd die without it.
A squiggly line tells you when you've done it wrong
What is something you can give away as many times you want without ever losing it?
No matter how little or how much you use me, you change me every month. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?