Including CSS

PHOTO EMBED

Tue Mar 16 2021 06:28:32 GMT+0000 (Coordinated Universal Time)

Saved by @francis_cubi 

wp_enqueue_style( $handle, $src, $deps, $ver, $media );

wp_enqueue_style( 'slider', get_template_directory_uri() . '/css/slider.css',false,'1.1','all');
content_copyCOPY

https://developer.wordpress.org/themes/basics/including-css-javascript/