Drupal 8 Insert query

The preferred form for most Insert queries is the compact form:

$result = $connection->insert('mytable')
  ->fields([
    'title' => 'Example',
    'uid' => 1,
    'created' => REQUEST_TIME,
  ])
  ->execute();

Degenerate form

$result = $connection->insert('mytable')
  ->fields(['title', 'uid', 'created'])
  ->values([
    'title' => 'Example',
    'uid' => 1,
    'created' => REQUEST_TIME,
  ])
  ->execute();

Drupal 8 documentation:

https://www.drupal.org/docs/8/api/database-api/insert-queries