Composer what?

Welcome to the Drupal Community!

Although Composer is the ubiquitous dependency manager for PHP, and although it functions much like (or rather better than) leading dependency managers for other programming languages, you are not the only person to have reported difficulty using it, or to question the reasoning behind requiring it to build Drupal websites. There is a lot of history behind how that came to pass which you can research by searching on drupal.org.

Drupal used to work the way you wish it would regarding module installation. There is a strategic initiative → to bring back that user experience and to in fact go beyond it to realize a kind of “App Store” (that’s my term for it) approach whilst hiding away the technical details. This initiative is targeted precisely to first-time users and similar cases.

This issue you opened is a support request in the Drupal Core issue queue, which does not function for the most part as a question-and-answer forum. See https://www.drupal.org/support → for better options. The #support channel in Drupal’s Slack workplace is a great place for interactive and open-ended discussion. https://drupal.stackexchange.com/ is good for focused and well-researched questions about Drupal.

Again, welcome!

The problem is, that now the same Open Social won't work properly. Can't turn on any of the module features. I only get the message that some files already exist, blah blah. And that's on a freshly installed Drupal. How's that possible?

I’m sorry you’re having some issues with Open Social. It’s a distribution, not a module, I think. If I’m correct you can’t just install a module from it and expect that to work. That could be the reason for that problem.

Like I said, this issue queue is not ideal for ongoing support conversations.

As I see it, it's a module. Thanks for the answers, not helping much anyway. https://www.drupal.org/support → as I can see points kinda towards the "issues" section or paying for your CMS setup to unknown companies. https://drupal.stackexchange.com/ - can't understand the point of the existing drupal.org then. Really messed up tbh. I guess the only option will be the other CMS, which can provide help within their website, not third-party like StackExchange, and is more newbie-friendly. Note to me - not all that glitters is gold.

You mention you want to use OpenSocial. I looked the Open Social project page → and it several ways to get support. They should be able to help.

• Bug and feedback through → issue queue on Drupal.org.
• User manuals for (end) users, site and content managers.
• main documentation → for general questions, contributing FAQ and more...

You did not follow the installation instructions for Open Social.