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<?php

$user = JFactory::getUser();
// enter user group id
$usergroup = '';
if(in_array($usergroup, $user->groups)) {
	// do something
}
else {
	// do something else
}

if ($user->authorise('core.edit', 'com_content')) {
	echo "<p>You may edit all content.</p>";
}
else {
	echo "<p>You may not edit all content.</p>";
}

if ($user->authorise('core.edit.own', 'com_content')) {
	echo "<p>You may edit your own content.</p>";
}
else {
	echo "<p>You may not edit your own content.</p>";
}