Need help installing Hoffman child theme

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As jdm2112 suggested, the WP Codex had a well-detailed explanation. A few observations based on your question:

  1. The text domain shouldn’t contain spaces
  2. The “Template” value should be the same as the directory name of your parent theme (check it)
  3. Make sure the child theme directory name is different from the parent theme, convention is to call it yourparenttheme-child where yourparenttheme is the directory name of your parent theme

  4. Why zip the folder? Simply upload the directory to /wp-content/themes/

  5. Don’t forget to add the functions.php file

  6. You should install the parent theme first, then the child theme

This is the standard header of a child theme (WP docs):

/*
 Theme Name:   Twenty Fifteen Child
 Theme URI:    http://example.com/twenty-fifteen-child/
 Description:  Twenty Fifteen Child Theme
 Author:       John Doe
 Author URI:   http://example.com
 Template:     twentyfifteen
 Version:      1.0.0
 License:      GNU General Public License v2 or later
 License URI:  http://www.gnu.org/licenses/gpl-2.0.html
 Tags:         light, dark, two-columns, right-sidebar, responsive-layout, accessibility-ready
 Text Domain:  twenty-fifteen-child
*/