These two questions are hard to answer because the lightning happens so fast that we see just a blinding light coming from the sky followed by a deafening thunder.
What, in ancient times, was considered divine powers, today is explained and detailed observed with help of science.
This video shows a slow motion lighting behavior.
We can see the three kinds of lightning: cloud to the ground, ground to the cloud and cloud to cloud.
Is also possible to see how the discharge. follows the ionized air of the previous discharge.
I wish you enjoy the video