How to hook into container

to hook in the <head> you would use wp_head. You can read the documentation here.

add_action( 'wp_head', 'meta_example' );

function meta_example() {

    echo '<meta name="description" content="Meta Description for this Page." />';

} // End meta_example()

This assumes that your theme has <?php wp_head(); ?> in the <head>.

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