The Google tag manager requires me to put one script inside the "head" tag and one at the beginning of the "body" tag.
I want to know what would be considered "best practise" to achieve this.
Are there any other ways than to create a child theme and place the Script in the header.php file?
>Solution :
You can use "Insert Headers and Footers by WPBeginner" plugin
https://wordpress.org/plugins/insert-headers-and-footers/