If you only import style.css, I can put this on the top of the head

 <link rel="stylesheet" href="<?php%20echo%20get_stylesheet_uri();%20?>" type="text/css" media="screen" />
If you add other styles, then add another one on the top of the head
  <link rel="stylesheet" href="<?php%20echo%20get_template_directory_uri();?>/bootstrap.min.css">

Another recommended method:

Add the following method to functions.php

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/**
* Load front-end scripts and style sheets
* Load the main style sheet style.css
*/
add_action(‘wp_enqueue_scripts’, ‘my_scripts’);
function my_scripts() {
//Load style.css in the theme
wp_enqueue_style(‘global’, get_stylesheet_uri());

//Load the xx.css style in the css folder
wp_enqueue_style(‘index-style’, get_template_directory_uri().’/css/xx.css’);

//Similarly, load xx.js in the js folder
wp_enqueue_script(‘index-js’, get_template_directory_uri().’/js/xx.js’);

//Load the default jquery library before loading tool.js
wp_enqueue_script(‘lingfeng-lazy’,get_template_directory_uri().’/js/tool.js’,array(‘jquery’));

}
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Then add this in the head to automatically import the style~

<?php wp_head();?>