drupal 9 deprecated code Report & some best practices

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Line src/Form/CopySafeVideoConfig.php
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90 Call to deprecated function db_query():
in drupal:8.0.0 and is removed from drupal:9.0.0. Instead,
get a database connection injected into your service from the container
and call query() on it. For example,
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Line src/Form/CopySafeVideoFileDelete.php
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56 Call to deprecated function file_delete():
in drupal:8.7.0 and is removed from drupal:9.0.0.
Use \Drupal\Core\Entity\EntityStorageInterface::delete() instead.
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[ERROR] Foun
* No direct routing from module list to admin configuration form
* core_version_requirement missing from info.yamld 2 errors