You can easily embed Instagram galleries into your Home page using Shopify sections.
1. Go to the Shopify themes section and click on the "Customize" button in your current theme.
2. It shows the Home page sections. Now click on the "Add section" button in the left menu.
3. Select on "Shoppable Instagram" under IMAGE category, and then click on "Add" button.
4. In the shown form, choose the wished gallery and layout.
5. When it is done, click on the back icon to view a list of all sections on your page.
6. Now you can drag and drop the gallery on the wished position.
7. Click on the "Save" button. That's it!