When creating a supplier order, you're shown suggestions for all products to reorder that are below the predefined minimum stock. Using the inventory planning feature under Products → Warehouse → Stock Overview, you can efficiently manage your inventory and determine the optimal minimum stock level.
At the top left, you can set a planning period. Select the start of the planning interval and the desired duration, then click Apply. For example, if you want to plan your inventory for the next three months, you can select the same period from the previous year. The stock overview will then show you, in addition to the current stock, target stock, and minimum stock, how often each product was sold during that period. On the right-hand side, you'll also see a chart showing the stock and sales development as well as the physical inventory of the respective product within the period you selected.
Based on the sales figures for the selected period, a red or green arrow indicates whether the product's target stock is too high or too low. You can adjust this using the Stock window on the bottom left, once you've selected the relevant product above. You can find more information about the Stock window in this article.
You can also use the stock overview to correct existing stock inconsistencies, among other things. You can learn more about stock inconsistencies in this article.