You can make your products into collections to make it easier for customers to find them by categories.
Step 1
Select Widgets: You can add widget to your Store.
Navigate to Manage > Active Widgets > Categories
Step 2
Navigate to Setting > Enable Include Children / Include Children of Selected Category Only.
On Include Children
After enable Include Children, Categories and sub categories will be visible on your store.
On Include Children of Selected Category Only
After enable Include Children of Selected Category Only, Main categories will be visible on your store.
Note: It also allows you to delete, sorting, vertical and horizontal your widgets.