Installing Drupal

Hi guys, I am new to the Drupal. It is a great CMS btw.

In a fresh installation of Drupal 8.5.1 on a Windows machine, in configuration page, I got the following warning.

Please help,

I was attempting to remove some cache entries and seem to have made a big mistake. I edited some database fields trying to correct an error pointing to the wrong address for bootstrap javascript file.

I am now getting a 500 error and cannot work out how to fix it and I am hoping someone has seen this or knows how to fix it please?

All signs seem to point to an issue with the 'locale' module and the system expecting a result as an array.

The following error is found at /update.php:

Hello,

I've been reading and trying all the possible solutions on internet about this subject but none were efficient. I am actually working as an intern and have very limited tools, for example I am not allowed to add modules such as Backup & migrate.

They gave me all the website's files and the whole (large) .sql database.

I've tried installing a fresh version of drupal and then adding the full database + copy all the files with the correct settings.php of course, or directly copy all the files and db but that just redirects me to install.php.

14 hours ago I could install drupal with composer create-project drupal-composer/drupal-project:8.x-dev drupal8 --stability dev --no-interaction - now installation always fails with following error message:

Hello community!  

I am tring to installa drupal using composer and am getting the following error. Help resolve it thanks