Remember that you can’t save multiple values (a tuple) with a single key of a DataStore, you’ll need to concatenate multiple values you wish to store into a single value & then store that value instead. You can’t store dictionary values in DataStores either.
SetAsync receives 4 parameters, the first representing the key of which a value is being set for/assigned to, the second representing the assigned value itself (hence can only be a single value per key in a DataStore), the third & fourth parameters are optional but for further information regarding them you can check out the link above.