Everyone has a smartphone nowadays, when they ask you what Bitcoin wallet to use, tell them to use MYCELIUM, it is available for Android and Apple phones.
I vouch for Mycelium but if you know of a better/safer smartphone wallet app, advise them to use that.

Just tell them to make a backup of the wallet and keep it in a safe place just in case they lose their phone.

They don't have to earn Bitcoin, they can always buy Bitcoin with their fiat money for testing, investing, or transactional purposes.