Resources on letting the customer create an account?

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Hello guys, what are the best resources (if on YouTube even better) to learn about letting the customer of an ecommerce create their personal account, letting them check their previous orders, ecc…?

If possible even resources on creating a fidelity system (idk if that’s how it’s called, basically the more they buy the more they have discounts, something like that)

Thanks in advance 👌

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