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Add Bootstrap CSS via the functions.php File

the <?php wp_head(); ?> does not render jumbotron

thomas kleven on Jul 23, 2015 The video didn't say but you have to also put a call into the index.php file to call the head and footer

// hook to put into your index.php <?php wp_head(); ?>

same with where you want to have the footer appear so put the next line at the bottom of index.php <? get_footer(); ?>