-What guides?

I'd try to be more of a guide to them than any link I can givs them, but I'd mainly want to give them some resources to help them learn about the concept of "open source" 

-Where to buy?

Through me or others who have it, avoiding any governmental KYC shit 

-How to store it?

I might buy them a trezor, recommend them to buy a trezor, or recommend them to use another cold storage solution with an airgapped Linux computer or something. Sinfully, in most cases, I actually recommend the least sus-looking open-source wallets for their phone, because that's what works in most cases, at least temporarily