What you say is true, one of which is important for us to have a list of existing product stock. And check physical stock regularly, and immediately add stock that is already running low.You wouldn't want to keep your customers waiting for a product or finding out you don't have some products. So how do you avoid this
You need to keep a tab on your products remaining statistics to avoid stockouts.
Take inventory stock frequently to know the ones to restock immediately
Have your supplier phone number handy to order for more stocks as soon as possible. you need to build strong supplier relationships. ..