how to add adsense ads code in header

Travelify
2

You can get this done by adding this code to Child Theme functions.php file. A sample Travelify Child Theme can be downloaded from here.

// Add AdSense in header via Child Theme functions.php
add_action( 'travelify_header', 'header_contact_details' , 7 );

function header_contact_details() {
	echo '<div class="header-adsense">Your adsense code goes here</div>';
}

It just a general idea and some CSS tweaking might be required.

Let me know if this helps.