In my themes root folder I create style.css file
And add this code into it.
/* Theme Name: Travel Theme URI: https://yourdomain.com Author: Shakil Zaman Author URI: https://wpcooltrics.org/ Description: This is a simple Travel theme Version: 1.0 License: GNU General Public License v2 or later License URI: http://www.gnu.org/licenses/gpl-2.0.html Tags: travel, adventure, tourism. Text Domain: travel */
These are the primary information of this theme. You can change these info according to your theme name, author name, version, tags etc.