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Many times, The user adds the same product more than once to the cart by mistake and this leads to unnecessary product buying. To avoid this, Magento 2 store owners can prevent customers to add the same product to the cart more than one time.

In Magento 2, if the shopping cart is empty then no product count is displayed on the mini cart. However, to show count 0 on the mini cart when the cart is empty, you can need to customize minicart.phtml and CSS file.