Add styles and scripts

functions.php

    // Enqueue styles and scripts.
    function theme_name_load_resources() {
    //css
        wp_enqueue_style( '$handle', get_template_directory_uri().'/src' );
    //js
        wp_enqueue_script( '$handle', get_template_directory_uri().'/src' );
    }
    add_action( 'wp_enqueue_scripts', 'theme_name_load_resources' );