What is light reaction?

In photosynthesis , light reaction includes :

Which is related to light reaction of photosynthesis

The movement of electrons as per Z - schems in light reaction is

What happens in light reaction (Photo chemical reaction)

What are the actual sites of light reaction and dark reaction inside the chloroplasts?

In terms of the spatial organization of photosynthesis within the chloroplast, what is the advantage of light reactions producing ATP and NADPH_(2) on the stromal side of the thylakoid membrane?

The light harvesting complex in light reaction is