How To Create a Custom HTML Section in Shopify
It is possible to add more code to your homepage using the "Custom HTML" feature. This is the ideal location to include any custom widgets or applications you'd want on your homepage, and the possibilities are almost limitless here!
Normally, themes include this area, but if your theme does not have it, you may manually add a "Custom HTML" section to your Shopify shop by following the instructions in this article.
From your Shopify admin, go to Online Store > Themes.
Find the theme you want to edit, and then click Actions > Edit code.
In the Sections directory, click Add a new section with the name section-custom-html