Cant find Header.php in the child theme

So i have the sydney child theme however i cant find the header.php in Appearance >> Editor
There is only theme footer, Theme functions and Stylesheet

I want to add the facebook pixel for camapigns and twitter meta-tags which in the intructional video they ask to put in the header.

please help

You won’t find it there unless you add that file.
However, you don’t need to add the full header.php file to add some script, you can just use a plugin like this: https://wordpress.org/plugins/header-and-footer-scripts/
I’m not very familiar with FB pixel but I guess it should work.