How to use composer?

Question

PHP

Help me understand, drum it into my head once and for all, how to use Composer?
I need this library
https://github.com/jenssegers/imagehash
I create a project on OpenServer in the domains folder. I open the console in OpenServer. I execute the command cd D:\OSPanel\domains\imagehash and go to the project folder. Next, I execute the composer require jenssegers/imagehash command
and a vendor folder is created in the project folder

spoiler

What do I need to do next? In order to at least run the example, which apparently lies in the src folder
, please explain clearly how to use this thing ..

Answer 1

https://getcomposer.org/doc/01-basic-usage.md#auto...