Google Analytics code can be added to the Astra theme with Astra Hooks plugin. It provides hooks so that you can insert custom code at various locations on the website without editing the theme』s core files.
Please follow the steps to add Google Analytics code-
Download Astra Hooks plugin. Install it like any other WordPress plugin and activate it.From the WordPress dashboard navigate to Appearance > Customizer > Hooks > Header > wp_head.Add the code with wp_head action.Publish it.
Other Notes:Astra Pro Addon plugin users can add Google Analytics code with Custom Layouts Module. (Recommended)