There are two main things that most people do to care for their cast iron after cleaning. The first thing that you will want to do is make sure that your cast iron is completely dry. Then, you may also choose to add a layer of oil to add another layer of protection. This can keep your cast iron in great shape. However, you should proceed with caution. Depending on the type of oil used and how often you use your cast iron, the oil can go rancid. If you don’t use your cast iron often but still want to use oil, add the layer and then try to wipe it off as much as you can, don’t leave excess oil behind.
You also need to consider how you’ll store your cast iron. There is a lot of options here, but the main thing that you will want to do is make sure that your cast iron won’t rust. Store everything in a dry place. You can also place a paper towel between each item if you are stacking cookware. To protect and store long term, you can use a coat of mineral oil. If you go that route, you will want to make sure that you thoroughly clean and re-season before use.