To create the child theme, first I have uploaded a backup of my wordpress files to my computer.

Unfortunately I couldn’t use my local (https://localwp.com/) because avast gave warning about there was a virus inside it. it called IDP.ALEXA.53

After that I created three files; style.css, functions.php and screenshot.png (I used same .png with parent theme.).

It was very difficult to generate codes and also not being able to see the live view before I downloaded my host. I need more time to process.