How do you make money on airdrop?

Could you please elaborate on the process of earning money through airdrops? I'm interested in understanding how exactly it works. Do you need to invest initially? How do you ensure the legitimacy of these airdrops? Are there any risks involved? What strategies would you recommend to maximize profits from airdrops? Also, how does the value of the tokens or coins distributed through airdrops fluctuate? Thank you for clarifying these points for me.