Customer Registration
Customer accounts let your customers log in to view their orders, profile information, and saved addresses. When a customer logs in, the details stored in their account are auto-filled during checkout for a faster checkout experience. Please read more in shopify well written detailed article
Steps:
From your shopify store Admin -> Click Settings -> Locate Customer accounts
at Accounts in online store and checkout, click edit
choose "Show login link in the header of online store and at checkout"
click Save
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