Welcome!

$db = JFactory::getDbo();

$query = $db->getQuery(true);

$query

->select($db->quoteName(array('custom_field_1')))

->from($db->quoteName('#__package_detail'))

->where($db->quoteName('name') .'='. $db->quote($package))

->order('ordering ASC');

$db->setQuery($query);

$expresult = $db->loadResult();

When you write sql query. You will always see quoteName from it right.

But, do you know what is the function of quoteName?

Below list can let you easily to understand it

quoteName = table name / column name

quote = variable (string)

int = number

So, when you target is table / column name, you should use quoteName

when you target is variable like string ($name), you should use quote

when you target is integer, you should use int

Below are the example:

$db->quoteName('name')

$db->quote('$name')

$db->int​(2)