I am conflicted as to choose which one....
If you will buy module or theme you no need tutorials and videos to help. Because technical support all do for you. If you have experience in Prestashop all next sites will be easy to develop. Just add module and set some preference.Ive been working with prestashop, shopify and woocommerce and everyones has their advantages.
I like prestashop because it's focus is ecommerce, and you can customize it a lot. You dont have a lot of tutorials, but I think its not to complicated.
With woocommerce you have to install a lot of plugins for this to work correctly, and then you have to optimize it. Its kinda frustrating sometimes, but you got a lot of tutorials and videos to help you.
Shopify works pretty well if you give them money. You can focus more on digital marketing here, and not just development. But it saves a lot of time if you just want to start selling quickly.