Where to add embed code on a custom theme

Hi, I am currently in the process of redesigning an existing website with a fully custom theme. I believe the original website was created using elementor.

I need to embed a smash balloon Facebook feed widget. Could someone tell me where I actually need to put the embed code in my html? The embed code is: [custom-facebook-feed feed=1] – do I use this as a class name?

This is my first attempt at creating a custom theme so any pointers are much appreciated!

 

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