Brian here from the Shopify support team :)
These are the steps you need to take, in order to display a "Best Sellers/Top Sellers" section on your home page.
1 - Create a collection and call it "Best Sellers" or "Top Sellers". Include all of your best selling products in that collection.
2 - When you have made the collection, you need to go to **Online Store** > **Themes**, and click the blue "Customize Theme" button to the right hand side of the page.
3 - Choose the "Home Page" option from the list on the right hand side. And in that section, scroll down and you will see that you can display featured collections that you want. In one of those featured collections sections, choose to display the Best Seller collection that you created.
You will then see it appear on your home page like you want.
I hope this helps you out, and if you need any more help with this, you can get in touch with our live support here - https://www.shopify.com/contact.