How do you get in on airdrops before they happen?

How do you guys get into airdrops? I’ve heard many different people get in on airdrops and getting some tokens from basically just using a service but how do you do this consistently and where do you hear it from? I want some free cryptocurrency just like everyone else but I have been struggling to find out how people find out about airdrops before they happen. Some people on here consistently get airdrops and make good money from them but I haven’t been able to get enough information on it on here which is why I am posting. So here are my questions:

1. How do you find out about airdrops before they happen?

2. What amount of money are we talking about here? Is it worth the effort?

3. Can anyone do this or do you have to be knowledgeable about the technology and economics of cryptocurrency to be able to land airdrops efficiently?