Attesa allows you to insert custom JavaScript code without having to create a child theme but directly through the customizer.
Go in your WordPress Dashboard under “Appearance-> Customize-> Attesa Theme Options-> Custom JS Code”.
You can choose to insert custom JS code in the header (in the <head> section) or in the footer (above the </body> tag).
In both cases it IS NOT necessary to insert the JS code inside the <script> tags.
NB: to carry out this operation, Attesa-Extra plugin must be installed and active on your website.