Advice on shopping cart addition to website

Hi all,
Currently my friend has a website designed in Wordpress which she would like redesigned and one of the changes she'd like to make is the addition of a shopping cart. I'm hearing mixed things about what to do if you want to add a shopping cart. One person said to forget about Wordpress altogether and and just use Shopify. I would love to hear your thoughts and what would be the best course of action.

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