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/jsonapi_extras/

FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/modules/jsonapi_defaults/README.txt
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FOUND 0 ERRORS AND 5 WARNINGS AFFECTING 5 LINES
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  5 | WARNING | Line exceeds 80 characters; contains 344 characters
  9 | WARNING | Line exceeds 80 characters; contains 96 characters
 10 | WARNING | Line exceeds 80 characters; contains 93 characters
 11 | WARNING | Line exceeds 80 characters; contains 94 characters
 12 | WARNING | Line exceeds 80 characters; contains 91 characters
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FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/modules/jsonapi_defaults/tests/src/Functional/JsonApiDefaultsFunctionalTest.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 16 | ERROR | Missing member variable doc comment
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FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/tests/src/Functional/JsonApiExtrasFunctionalTest.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 25 | ERROR | Missing member variable doc comment
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FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/src/Form/JsonapiExtrasSettingsForm.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 16 | ERROR | Missing member variable doc comment
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FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/src/Plugin/jsonapi/FieldEnhancer/JSONFieldEnhancer.php
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FOUND 8 ERRORS AND 2 WARNINGS AFFECTING 9 LINES
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  9 | ERROR   | [x] There must be one blank line after the last USE statement; 2 found;
 23 | ERROR   | [ ] Missing short description in doc comment
 28 | ERROR   | [ ] Missing short description in doc comment
 30 | ERROR   | [ ] Missing parameter comment
 31 | ERROR   | [ ] Missing parameter comment
 32 | ERROR   | [ ] Missing parameter comment
 32 | ERROR   | [ ] Missing parameter type
 33 | ERROR   | [ ] Missing parameter comment
 76 | WARNING | [x] A comma should follow the last multiline array item. Found: ]
 77 | WARNING | [x] A comma should follow the last multiline array item. Found: ]
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PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/src/Plugin/ResourceFieldEnhancerInterface.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 5 | WARNING | [x] Unused use statement
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/css/jsonapi_extras.expandable_rows_table.css
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FOUND 10 ERRORS AFFECTING 10 LINES
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  2 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
  3 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
  7 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 11 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 12 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 16 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 20 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 24 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 28 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 32 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
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PHPCBF CAN FIX THE 10 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/drupal-8/modules/contrib/jsonapi_extras/jsonapi_extras.module
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FOUND 1 ERROR AFFECTING 1 LINE
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 52 | ERROR | Type hint "array" missing for $variables
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Time: 1.69 secs; Memory: 14MB