Sure! Please check this article which contains details information and explanation about child themes:
Basically, it is a good practice to have a child theme installed and activated before you start working on the site just in case you will need to add some custom code or edit the main theme files just like in this case. Making changes to the child theme is important because if you directly edit the files of the parent theme, those changes will disappear if you update the theme.
Here are some more articles about child themes:
Hope these help.