My girlfriend asked me about crypto because she wants to invest smarter than hodling euros and I realised I don't know shit

So I guess my question is; what are some of the best ways to invest and accumulate? I am talking good places to stake, ways to earn free crypto (moons/splinterlands), guaranteed moonshots (sike), or recommendable trading guides/books (now reading Jack Schwager). Would also love a good video or method to explain more about the deflationary aspect or other factors that could make one confident