You can make money renting out your condo while you are away traveling the world. However, you might find condominium key exchange a challenge. How do you hand over the keys when you are in another country?
You could ask someone else to meet the renters on your behalf but not everyone has a friend or neighbor who is willing to do this. Consider getting a lock box instead. Provide the code to open the lock once you have received the payment.
Another way is to use a digital lock that you can open remotely. You need to remove the old door locks and use this instead. Connect it with your phone through an app and generate codes that can be given to your renters, cleaners, service crews, and maintenance workers. You can even open the door wherever you are.