So, there we have two different, albeit similar, tempstores that you can use for various cases. If you need to store session-like data available to the user across multiple requests but which is private to them, you can use the PrivateTempStore. Alternatively, if this data needs to be used by either multiple users at once or the opposite, preventing multiple users from working on something at the same time, you can use the SharedTempStore.

Both of them have an easy-to-understand API with simple methods and you can be flexible in terms of creating your own collections for whichever use case you need.