Please help me I don't understand this

How to identify domain and range from co-ordinate pair.
Now g(-2)=0
Answer:
5
Step-by-step explanation:
First you want to find f(-2)
Then whatever f(-2) equal, you plug into g(x) to find g(f(-2))
So first lets find f(-2)
Looking at the f(x) graph. When -2 is inputted ( x value -2 ) the output is 1
So f(-2) = 1
We then plug in 1 into g(x) to find g(f(-2))
Think of it as 1 replacing f(-2) in g(f(-2)) because f(-2) = 1
So g(f(-2)) = g(1)
We then look at the graph g(x)
when 1 is inputted the output is 5
Therefore g(f(-2)) = 5