Using a child theme allows you to customize a theme without having to worry about any updates breaking the changes you have made in the theme files.
To speed up this process, we have already created an Attesa child theme, ready to be customized as you wish. You can download the child-theme from this link.
Keep in mind that a child theme installs as a common theme, and that to work properly it is necessary that the parent-theme (in this case Attesa) must be installed but inactive.
If you need more information on how to use and customize a child theme, you can have a look at the official WordPress.org page dedicated to child-themes