Running phpcs --standard=Drupal --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml  shows the following errors/warnings that should be fixed.
FILE: D:\xampp\htdocs\drupal9\web\modules\user_node_access\README.txt
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 1 | WARNING | Line exceeds 80 characters; contains 91 characters
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FILE: D:\xampp\htdocs\drupal9\web\modules\user_node_access\user_node_access.install
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FOUND 2 ERRORS AND 4 WARNINGS AFFECTING 5 LINES
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  1 | ERROR   | [x] Missing file doc comment
  1 | ERROR   | [x] End of line character is invalid; expected "\n" but found "\r\n"
  3 | WARNING | [x] Unused use statement
 11 | WARNING | [ ] Format should be "* Implements hook_foo().", "* Implements hook_foo_BAR_ID_bar() for xyz_bar().",, "* Implements hook_foo_BAR_ID_bar() for
    |         |     xyz-bar.html.twig.", "* Implements hook_foo_BAR_ID_bar() for xyz-bar.tpl.php.", or "* Implements hook_foo_BAR_ID_bar() for block templates."
 34 | WARNING | [x] A comma should follow the last multiline array item. Found: ''
 44 | WARNING | [ ] Format should be "* Implements hook_foo().", "* Implements hook_foo_BAR_ID_bar() for xyz_bar().",, "* Implements hook_foo_BAR_ID_bar() for
    |         |     xyz-bar.html.twig.", "* Implements hook_foo_BAR_ID_bar() for xyz-bar.tpl.php.", or "* Implements hook_foo_BAR_ID_bar() for block templates."
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PHPCBF CAN FIX THE 4 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: D:\xampp\htdocs\drupal9\web\modules\user_node_access\user_node_access.module
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FOUND 45 ERRORS AND 26 WARNINGS AFFECTING 48 LINES
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   1 | ERROR   | [x] End of line character is invalid; expected "\n" but found "\r\n"
   3 | ERROR   | [ ] Missing short description in doc comment
   7 | WARNING | [x] Unused use statement
   7 | ERROR   | [x] When importing a class with "use", do not include a leading \
   8 | WARNING | [x] Unused use statement
   8 | ERROR   | [x] When importing a class with "use", do not include a leading \
   9 | ERROR   | [x] Use statements should be sorted alphabetically. The first wrong one is Drupal\Core\Form\FormStateInterface.
   9 | ERROR   | [x] When importing a class with "use", do not include a leading \
  10 | WARNING | [x] Unused use statement
  12 | WARNING | [x] Unused use statement
  14 | WARNING | [x] Unused use statement
  16 | WARNING | [x] Unused use statement
  17 | WARNING | [x] Unused use statement
  18 | WARNING | [x] Unused use statement
  18 | ERROR   | [x] There must be one blank line after the last USE statement; 2 found;
  22 | WARNING | [ ] Format should be "* Implements hook_foo().", "* Implements hook_foo_BAR_ID_bar() for xyz_bar().",, "* Implements hook_foo_BAR_ID_bar() for
     |         |     xyz-bar.html.twig.", "* Implements hook_foo_BAR_ID_bar() for xyz-bar.tpl.php.", or "* Implements hook_foo_BAR_ID_bar() for block templates."
  24 | ERROR   | [x] Expected 1 blank line before function; 2 found
  29 | ERROR   | [x] Namespaced classes/interfaces/traits should be referenced with use statements
  39 | ERROR   | [x] TRUE, FALSE and NULL must be uppercase; expected "TRUE" but found "true"
  43 | ERROR   | [x] TRUE, FALSE and NULL must be uppercase; expected "TRUE" but found "true"
  76 | ERROR   | [x] Function comment short description must start with exactly one space
  76 | ERROR   | [x] Doc comment short description must end with a full stop
  80 | WARNING | [ ] Line exceeds 80 characters; contains 226 characters
  81 | WARNING | [ ] Line exceeds 80 characters; contains 113 characters
  81 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
  82 | WARNING | [ ] Line exceeds 80 characters; contains 117 characters
  82 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 6
  83 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
  85 | ERROR   | [x] No space found before comment text; expected "// die;" but found "//die;"
  85 | ERROR   | [x] Inline comments must end in full-stops, exclamation marks, question marks, colons, or closing parentheses
  86 | WARNING | [ ] Line exceeds 80 characters; contains 116 characters
  86 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 3
  87 | WARNING | [ ] Line exceeds 80 characters; contains 107 characters
  87 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
  88 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 3
  90 | WARNING | [ ] Line exceeds 80 characters; contains 110 characters
  90 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 3
  91 | WARNING | [ ] Line exceeds 80 characters; contains 106 characters
  91 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
  92 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 3
  94 | WARNING | [ ] Line exceeds 80 characters; contains 224 characters
  94 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 3
  95 | WARNING | [ ] Line exceeds 80 characters; contains 110 characters
  95 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 4
  96 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 3
  98 | WARNING | [x] There must be no blank line following an inline comment
  98 | ERROR   | [x] Line indented incorrectly; expected 2 spaces, found 0
  98 | ERROR   | [x] No space found before comment text; expected "// dump($access_allow['scheduler']);die;" but found "//dump($access_allow['scheduler']);die;"
  98 | ERROR   | [x] Inline comments must end in full-stops, exclamation marks, question marks, colons, or closing parentheses
 100 | WARNING | [x] There must be no blank line following an inline comment
 100 | ERROR   | [x] No space found before comment text; expected "// dump($access_allow['scheduler']['start']);die;" but found
     |         |     "//dump($access_allow['scheduler']['start']);die;"
 100 | ERROR   | [x] Inline comments must end in full-stops, exclamation marks, question marks, colons, or closing parentheses
 102 | WARNING | [ ] Line exceeds 80 characters; contains 99 characters
 103 | WARNING | [ ] Line exceeds 80 characters; contains 116 characters
 103 | ERROR   | [ ] Comment indentation error, expected only 1 spaces
 104 | WARNING | [ ] Line exceeds 80 characters; contains 118 characters
 104 | ERROR   | [ ] Comment indentation error, expected only 3 spaces
 106 | ERROR   | [x] Inline comments must end in full-stops, exclamation marks, question marks, colons, or closing parentheses
 110 | ERROR   | [x] Function comment short description must start with exactly one space
 110 | ERROR   | [x] Doc comment short description must end with a full stop
 133 | WARNING | [ ] Format should be "* Implements hook_foo().", "* Implements hook_foo_BAR_ID_bar() for xyz_bar().",, "* Implements hook_foo_BAR_ID_bar() for
     |         |     xyz-bar.html.twig.", "* Implements hook_foo_BAR_ID_bar() for xyz-bar.tpl.php.", or "* Implements hook_foo_BAR_ID_bar() for block templates."
 135 | ERROR   | [x] Namespaced classes/interfaces/traits should be referenced with use statements
 144 | WARNING | [ ] Format should be "* Implements hook_foo().", "* Implements hook_foo_BAR_ID_bar() for xyz_bar().",, "* Implements hook_foo_BAR_ID_bar() for
     |         |     xyz-bar.html.twig.", "* Implements hook_foo_BAR_ID_bar() for xyz-bar.tpl.php.", or "* Implements hook_foo_BAR_ID_bar() for block templates."
 146 | ERROR   | [x] Namespaced classes/interfaces/traits should be referenced with use statements
 156 | WARNING | [ ] Format should be "* Implements hook_foo().", "* Implements hook_foo_BAR_ID_bar() for xyz_bar().",, "* Implements hook_foo_BAR_ID_bar() for
     |         |     xyz-bar.html.twig.", "* Implements hook_foo_BAR_ID_bar() for xyz-bar.tpl.php.", or "* Implements hook_foo_BAR_ID_bar() for block templates."
 161 | ERROR   | [x] Expected one space after the comma, 0 found
 162 | ERROR   | [x] Line indented incorrectly; expected 6 spaces, found 4
 162 | ERROR   | [x] Object operator not indented correctly; expected 6 spaces but found 4
 163 | ERROR   | [x] Line indented incorrectly; expected 6 spaces, found 4
 164 | ERROR   | [x] Line indented incorrectly; expected 6 spaces, found 4
 165 | ERROR   | [x] Line indented incorrectly; expected 6 spaces, found 4