To include scripts, stylesheet or any tags in head or body, please use Global scripts feature which is located in Template > Theme Configuration > JavaScripts.
From there, you can add HTML tags in any available positions
Example: Adding Google Fonts
Step 1: Go to Google fonts
Step 2: Find the font you like and click Get Font >> Get embed code. example: https://fonts.google.com/selection/embed
Step 3: Click copy code in each area 1 by 1
Step 4: Copy the embed code and go to the Global Scripts section, enter the required information. Then press Save and you are good.
