Important thing to note is the following:
If you put the script in the head tag HTML page rendering is blocked until the script is downloaded.
The more scripts you will put there the slower your page will load.
That’s why an advanced approach is to put the scripts at the bottom of the BODY, and in this case the user can start interacting with a page before the Javascript has Loaded.
You will put the scripts in HEAD only if they MUST be available before the page is shown.
