Sourdough starter is for starting Herman cake or sourdough bread you can buy starters in the baking section if it's easier or you can home make it
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I iused the i'ble RMS to make my own starter. it was cool and a lot of fun!
You can buy sourdough starter mixes from the store, but it's easy to make your own:https://www.instructables.com/id/Catching-wild-yeast-and-making-sourdough/