Answer to this question is indeed very simple & you will also find the understandable reasons for the answer in this blog.
You can place any number of scripts in an HTML document.
You can even define multiple script tags in head or body.
In the below HTML code, Script tag is placed in both the places for demonstration purpose.
There are certain reasons for placing it at the end of the body.
Here are the reasons.
Expecting the understanding is clear now.
Comment below for any queries.