Define a new font

I want to define a new font for all headings and bodies which is not included in the font list;

I have 2 question about it:

1- I want to add “playfair display”-font. Is the follownig code correct?

add_filter( ‘avf_google_heading_font’, ‘avia_add_heading_font’);
function avia_add_heading_font($fonts)
{
$fonts[‘Playfair Display’] = ‘Playfair Display Narrow:400,700’;
$fonts[‘Playfair Display’] = ‘Playfair Display:400,700,400italic,700italic’;
return $fonts;
}

add_filter( ‘avf_google_content_font’, ‘avia_add_content_font’);
function avia_add_content_font($fonts)
{

$fonts[‘Playfair Display’] = ‘Playfair Display:400,700,400italic,700italic’;
$fonts[‘Playfair Display Narrow’] = ‘Playfair Display Narrow:400,700’;
return $fonts;
}

2-On Enfold has 2 Function.php. Which one should mentioned code add to?

– wp-content/themes/enfold/functions.php
or
– wp-includes/functions.php