Click the [website] tab from the left side menu, click [add page], then select the [shop page] from the pop-up window. 

Then click square-shaped the edit icon to load the page editor.

Make sure you've added products to your store. They will appear on this page.

Click "Shop products" from the left side menu to view the settings of that page block.

Here you can give the section a title, description, and you can customize the layout with alignment options. There are also options for displaying products by category and enabling a side bar for category navigation. Click here to learn How To Display Store Products by Category.