I'd tell them

- Buy daily from an exchange, and I'd recommend some exchanges.
- When it feels like too much to lose, get a hard ware wallet, and I'd recommend some.
- Don't sell if you can avoid it, but please spend the bitcoins if you can - and buy them back directly. HODL & SPEDN if you like wrods.

Then I'd point them to these resources: 

- https://dergigi.com/bitcoin/ for philosophy, explanations and thoughts about Bitcoin in text format ( nostr:npub1dergggklka99wwrs92yz8wdjs952h2ux2ha2ed598ngwu9w7a6fsh9xzpc )
- https://www.youtube.com/@IoniAppelberg for philosophy, explanations and thoughts about Bitcoin in video format (only birdapp)
- https://github.com/kallerosenbaum/grokkingbitcoin for a fantastic explanation of how bitcoin works (not sure where to find him, I think he's on birdapp)

Then invite them to a local community where they can ask all the questions. There's no good complete guide out there, and no good guide which fits all people. Too much too fast. I think asking questions when they arise is the way to go.