How do I earn airdrops?

Hey there, could you explain to me in simple terms how exactly one can earn airdrops in the world of cryptocurrency? I've heard about them but I'm still a bit hazy on the process. Are there specific steps I need to follow or is it more of a luck-based thing? Also, are there any risks associated with earning airdrops that I should be aware of? Any insights you can provide would be greatly appreciated!