• How do you create an observable that emits only one value?
• How do you create an observable that emits one item from each line of a text file?
• Does the just operator return a cold or a hot observable?
• What operator can you use to convert a cold observable to a hot observable and to start to emit items when a first observer subscribes to it?
• Why is it important that observers handle errors?
• How can you convert an observable error to an observable item?
• Why should subscriptions be disposed?