How does water enter a plant or get to the leave?

The plant gets water from the ground through it's roots.

How does CO2 enter the leaf.

From the air with water from the ground into glucose.

what does the plant do with the sugar it makes ?

by using energy from the sunlight to transform CO2 from the air with the water fro the ground into glucose.

what are the final product of photosynthesis and how are they important ?

glucose and oxygen are the final products of photosynthesis and photosynthesis is essential for all life on earth