If you’re new to Shopify we’d recommend taking a look at their documentation to get a better overview of how the platform works before you start working with the theme. You’ll find most things to be straightforward and user friendly but it’s a good place to start and can save you some time and headache later on.

Main Shopify manual you can find here:  

https://help.shopify.com/

Everything related to products, collections, and menus can be found here: 

https://help.shopify.com/en/manual/products

https://help.shopify.com/en/manual/products/collections

https://help.shopify.com/en/manual/online-store/menus-and-links/editing-menus

To better understand theme structure and functionality check these resources::

https://help.shopify.com/en/manual/online-store/themes

https://help.shopify.com/en/manual/online-store/themes/theme-structure/templates

https://help.shopify.com/en/manual/online-store/themes/theme-structure/sections-and-blocks