You can configure default settings for products by clicking Settings in the shop admin panel menu and then clicking Product defaults.
Default stock notification level
If you use stock control, each product can have a stock notification level. When the stock falls below the notification level you are notified. If you use the same stock notification level across a range of products, you can enter a default value here, which will then be used when creating new products.
Default product units (singular), Default product units (plural)
When editing a product, you can specify product units, which are displayed whenever a quantity of the product is shown. For example, a product could have units of boxes, in which case quantities of 1 and 2 would be shown as 1 box and 2 boxes respectively. If you use the same units across a range of products, you can enter default values here, which will then be used when creating new products.