There a lot of methods to earn cryptocurrencies. You can do airdrops, bounties and sell a service for cryptocurrencies without any investment. You can do mining, staking and lending with some investments. You can participate in ICOs and IEOs with good projects. Fist of all, you have to learn more about those things.
Everything you list as possible sources of profit is very risky and generally susceptible to fraud. Almost worthless tokens that you maybe get in some airdrop, or $1 for weeks in some bounty its mostly a waste of time. An even greater danger is threatening in all that because of your data given through KYC procedure, abuse can occur with serious consequences for users.
Mining of cryptocurrency is just a bad advice for a newbie, it is mostly reserved for big players who have money to invest and very cheap electricity, which may bring them profit in long-term.
I agree he needs to learn, most importantly how to avoid all those crypto mines in the cryptocurrency field. A good start is to avoid all mentioned above.