General

We can use the following command for downloading and enabling module till the version of drupal7 drush dl module_name drush en module_name -y In Drupal 8 and Drupal9 you no longer use Drush. Use composer command instead  composer require drupal/module_name After, you will need to enable the module using the Drush command

Check how to enable or disable maintenance Mode using Drush.

We can install the latest version of drupal9 using the following command. composer create-project drupal/recommended-project my_site_name_dir This will create a project in 'my_site_name_dir' and automatically execute composer install to download the latest stable version of Drupal and all its dependencies. Your 'my_site_name_dir' will contain files that should be outside of your web root and not accessible by the web server. The web root will be 'my_site_name_dir/web'.

Actually, we can't install an incompatible module with the composer and apply a compatibility patch afterward. However, since issue forks are branches it's possible to install the module using that branch.  Under the repositories section where the composer source is listed, we need to add an exclude key for our module that we're trying to install using the issue fork. In the following example trying to install an issue for the homebox module. Complete repositories key look like  this now:

  We can use loadByProperties method in the \Drupal\Core\Entity\EntityStorageInterface.it will help us to search the file entity by the given file URI: /** @var \Drupal\file\FileInterface[] $files */ $files = \Drupal::entityTypeManager() ->getStorage('file') ->loadByProperties(['uri' => $uri]); /** @var \Drupal\file\FileInterface|null $file */ $file = reset($files) ?: NULL; In some other cases if you don't know the file URI    We can use the below code to get the URI: