Running a business is tricky and so is managing stock! It is very hard to keep track of what is coming in and what is going out without a good system in place. The right software system should help you to electronically manage what is going in and out of your business and make it easy to review your stock levels at a glance.
From there, stock management is something you should get better at over time. By doing strategic forecasting and keeping track of what your best performers are you should be better positioned for less stock overflow.