If you've spent too much time with Magento, like me, you've probably seen an error message that says "Your session has expired" when you click add to cart in Magento 2.3 localhost.
This can happen if you have a fresh Magento 2.3 installation and are testing product functionality by adding items to the cart.
To get rid of the expired session error, you must try the solution.
In order to find a solution, “Your Session Has Expired” On Clicking Add To Cart In Magento 2.3 Localhost, Visit: https://meetanshi.com/blog/solution-your-session-has-expired-on-clicking-add-to-cart-in-magento-2-3-localhost/