What does this rebus riddle means ?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

The dirtier I get, the whiter I look. Who am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Can you find out the remainder when 3^300 is divided by 5?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

What month of the year has 28 days?

How can a man go eight days without sleep?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?