Hey, azai studios!
Lizzy here, I'm a Guru on the support team at Shopify.
It sounds like you might find UTM Parameters useful for tracking customers that have been redirected to your site. Using UTMs with your URL will add information onto the end of the link your customers are redirected to. This will make their visit uniquely trackable. We have a blog post which explains all about setting them up with Google Analytics.
If you'd prefer to be able to see that information directly within your Shopify admin we have some great reporting apps you could use as well. The two I've linked below have integrations with Google Analytics. With these, you could use the two methods together. They're both free to install and have contact information on the app pages, so you can reach out to the developers and make sure the app will work for you before committing.
I hope that helps to answer your question! Please let me know if you have any other questions about it.