See what operations are available for all entities on a Drupal site for common Users

access.php

<?php

// Run this with drush, like "drush scr access.php"

use Drupal\user\Entity\User;

// You should delete this user after you're done testing.
if (!($auth = user_load_by_name('tmp_access_script'))) {
  $auth = User::create(['name' => 'tmp_access_script']);
  $auth->save();
}

$users = [
  'anon' => User::getAnonymousUser(),
  'admin' => User::load(1),
  'auth' => $auth,
];

$etm = \Drupal::entityTypeManager();
foreach ($etm->getDefinitions() as $type) {
  foreach ($etm->getStorage($type->id())->loadMultiple() as $entity) {
    foreach (['create', 'view', 'update', 'delete'] as $operation) {
      try {
        foreach ($users as $user_type => $user) {
          if ($entity->access($operation, $user)) {
            echo "{$user_type} {$operation} {$type->id()} {$entity->id()}\n";
          }
        }
      }
      catch (\Exception $e) {}
    }
  }
}