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What is safer, is using the block-chain. Once you get some coins, send them to a "core wallet", he will need a computer for this. A core wallet downloads and verifies the entire block-chain, it is therefore not so easy to use at the outset. However the learning opportunities are immense. Even understanding why core wallets exist, is important. With core wallets you can really get into how it all works, as well as a nice graphical interface, there is the RPC and/or command line interface. This is where you start to see how it all really works, if he has an interest in coding at all, this will be like a candy shop for him. https://github.com/BlockchainCommons/Learning-Bitcoin-from-the-Command-Line is a good resource.