Trying to understand fastcgi

I was trying to understand the fastcgi forwarding. The example shows:

server {
listen 80;
root /home/website/www;
index index.html;
location / {
fastcgi_param SCRIPT_FILENAME
fastcgi_param PATH_INFO $fastcgi_script_name;
include fastcgi_params;

in SCRIPT_FILENAME, does $document_root == root /home/website/www; ?
and what value is usually stored in (SCRIPT_NAME)
$fastcgi_script_name? i don’t understand what script SCRIPT_NAME
refers to. Am i suppose to set it or does it set itself?

It also says QUERY_STRING $query_string; is needed for configuring
fastcgi. But this example clearly hasn’t used it?

Is the idea to have fastcgi_param for only the variables i want to
include? or is this config simply defining them with a value by

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