Drupal best practices and coding standards

Hey, I came across some best practices issues and coding standards, example of Drupal practices :

phpcs --standard=Drupal modules/contrib/faqfield/

FILE: /var/www/drupal-8/modules/contrib/faqfield/src/Plugin/Field/FieldWidget/FaqFieldDefaultWidget.php
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FOUND 1 ERROR AND 2 WARNINGS AFFECTING 3 LINES
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 213 | ERROR   | [x] Space found before comma in function call
 215 | WARNING | [ ] Do not concatenate strings to translatable strings, they should be part of the t() argument and you should use placeholders
 216 | WARNING | [ ] Do not concatenate strings to translatable strings, they should be part of the t() argument and you should use placeholders
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/drupal-8/modules/contrib/faqfield/faqfield.module
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FOUND 6 ERRORS AFFECTING 6 LINES
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  12 | ERROR | [x] When importing a class with "use", do not include a leading \
  88 | ERROR | [ ] Type hint "array" missing for $variables
 104 | ERROR | [ ] Type hint "array" missing for $variables
 119 | ERROR | [ ] Type hint "array" missing for $variables
 139 | ERROR | [ ] Type hint "array" missing for $variables
 160 | ERROR | [ ] Type hint "array" missing for $variables
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Time: 341ms; Memory: 10MB