Answer:
I am a person who pretends to be someone else
I beam I shine I sparkle white. I’ll brighten the day with a single light. I’ll charm and enchant all I’ll bring the best in you all.
I am wood that is neither hard straight or crooked
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
I beam, I shine, I sparkle white. I'll brighten the day with a single light. I'll charm and enchant all. I'll bring the best in you all. What am I?
No matter how little or how much you use me, you change me every month.