Name of the theme don't change after copy in the child themes's folder

I think I understand what you are asking. To create a child theme you do not need to copy anything from the parent theme to the child theme folder. So your structure may look something like this: wp-content/ - parent_theme_folder/ - functions.php -style.css -page.php -etc

- child_theme_folder/  <--- note that the child theme folder name is different than parent
      -functions.php  <-- can be blank
     - style.css  <-- a new css file, not copy of parent.

Then your child themes style.css will look something like this:

/*
Theme Name: My Child Theme                           <<---- this gives Wordpress the name of your Child theme
Description: this is a child theme
Author:  Me
Template: parent_theme                    <<---- this is the name of the theme that this child theme depends on (the parent theme)
Version: 1.0
*/
@import url("../parent_theme_folder/style.css");         <<----- this imports the parent's stylesheet into the child theme's stylesheet.

hope that helps.

+1 For Andrew's point.

However, do you mean that you downloaded the style.css file from the project downloads for this video or from the parent theme?

Can you post up the CSS that you're using for your child theme please.

Hi everybody.

I don't understand how create a new style.css with the information between /* */ are include directly. If I create style.css in my child theme folder, the file is empty and If I copy the file style.css from the project (localy) or transfer the file from the servor are exactly the same. First, do I need to customize the parents file style.css with the information of my website like (I buy a premium theme but I try to do first with a free wordpress theme). Sorry to disturbed you, but i'm a little bit lost ! :-) Thanks.

This is my parent theme style.css

            /*
Theme Name: Twenty Fourteen
Theme URI: http://wordpress.org/themes/twentyfourteen
Author: the WordPress team
Author URI: http://wordpress.org/
Description: In 2014, our default theme lets you create a responsive magazine website with a sleek, modern design. Feature your favorite homepage content in either a grid or a slider. Use the three widget areas to customize your website, and change your content's layout with a full-width page template and a contributor page to show off your authors. Creating a magazine website with WordPress has never been easier.
Version: 1.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Tags: black, green, white, light, dark, two-columns, three-columns, left-sidebar, right-sidebar, fixed-layout, responsive-layout, custom-background, custom-header, custom-menu, editor-style, featured-images, flexible-header, full-width-template, microformats, post-formats, rtl-language-support, sticky-post, theme-options, translation-ready, accessibility-ready
Text Domain: twentyfourteen 

This theme, like WordPress, is licensed under the GPL.
Use it to make something cool, have fun, and share what you've learned with others.
*/

I think that I have understand alone. Nothing was automatic. You must create the style.css with the comment to import the parent information ! Thanks for helping me I have very appreciate !

Yes ! Perfect ! It's a confirmation that I have understand before alone ! So Thanks you very much !