We do not need to learn about earthing

[amar]

what's the point of giving EARTHING in the circuits such as the one attached to my question?

they have absolutely no affect on the answer right?

or at least, why does this case it have no affect on the answer?

and can someone provide a circuit where it does have an effect on the answer?

[Mao]

They are more of an 'indicator'. This Earth lead runs in parallel with the bottom horizontal line, and since Earth has a potential of 0V, this indicates the bottom line has a potential of 0V.

In the case of VCELand, where a circuit like this does not have an Earth, you usually assume the bottom line is 0V. Including the earth is mostly a matter of having things 'technically correct'.