The default Magento does not show any count on mini cart when the cart is empty. To show, count 0 on the mini cart when no product is in the cart, follow the steps.
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.
Checkout Steps: Magento 2: Show Count 0 on Mini Cart when No Product is in Cart















