what exactly do i do with this file. I am a bit confused on this. Is there anyone that can explain?

what command do i use to install composer, and what command do i use to install elgg with composer. I am having issues with this installing it where it needs to go.

I have tried every which way to figure this out, I need example configurations to understand how to install elgg as composer project correctly.

For instance Elgg-cli install [---- config what else do i do.

What do i put under the global config section of settings.example.php file in elgg.
The new/stdclass is there where i put my website or installer information? Anyone able to answer this?

Where exactly do i begin building my project in elgg?
Where exactly do I add a folder for my project in elgg?

I have read all the documentation on elgg, but still having difficulty understanding.

I need some examples?