Airdrops: (https://icomarks.com/airdrops).

Of course its the easiest one without any risk. However, most of them are requiring KYC now and I don't like giving out my private information. With that said, you can find a lot of bounties that doesn't have KYC but of course you have to due your due diligence and common sense. If something raises some red flag then don't join, simple as that. So if your goal is to make more money, I advise to go for a bounties. I have one good experience with a bounty which I work for two weeks only but I was able to get more than $1K payment. Imagine a 2 week work, probably cost me 1 hour day x 5 days, and getting $1K for that.