Assuming you know this person personally 

What guides?
For a non-technology person, I would personally show them the ropes. This allows for Q&A, best practices, etc. I lean toward learn by doing, so I taught myself the basics. But I understand not everyone likes that risk when it comes to money.

Where to buy?
Dependent on what jurisdiction this person lives, but I found using an app like strike or cash app to be most familiar and easy to use

How to store? 
I would recommend to start with something like exodus, or similar non-custodial wallet. Once this person experiments with a few transactions, dive in to cold storage through hardware wallets. Having used several, tezor to me is the best due to cast and ease of use. Knowing the distinction between hot and cold wallets is crucial imo 

Can’t wait to hear what others say!