While setting the correct expectations with your customers regarding when will they get their order. You can enable Preorders for specific products/variants, Collections or All Products. You can also conditionally enable/disable preorders based on whether something is in stock or out of stock or if you have incoming inventory. Limit the number of preorders you wanna accept or Show a delivery text on product, cart, checkout page. This can be used, as follows:

To Keep selling products even when out of stock (This boosts your revenue $$$)For selling products before they are released (PreSale to create Hype)To test demand for new potentially winning products without buying inventoryFor selling Made to order/Custom products or running a crowdfunding campaignNo Coding required for you. We don't mess with your theme. 24/7 Support.