Question Composer: Understanding

[omexlu]

Hello,

I have problems understanding the composer system (because never used it).

Let's say I want to install the following package:
vlucas/valitron

All I have to do here is this:

• Put the composer.json from github in httpdocs?
• Scan via the Plesk-GUI and install or update?
• Then in most cases an autoload.php will be created which I only have to integrate into my projects.

1. BUT what if I want to install a second composer.json now?
2. I can't put this in the httpdocs anymore?
3. A second autoload.php, how this works?
4. Or how should composer.json be classified?

I don't understand the whole process and would be happy if someone could enlighten me

Thanks in advance.