Yes, it is better to search for airdrops through reliable sites. There are reliable sites that specialize in these free airdrops and greatly facilitate your work.
Can you mention one, two or some of the reliable sites? What I know is that airdrops can be useless, waste of time, not profitable even if they are not scam, but they can also be scam.
A friend told me of a telegram channel like three years ago, he said it is reliable, but it turned to be scam for me. I did not pay any VIP fee and I was not scammed because I knew already that it was a scam.
Working in airdrops involves a lot of risk, so it is better not to use your main wallet to get airdrops, and it is better to create a new wallet, as well as an email and password for each airdrop.
I will not advice that too, but not that you connect your wallet to any site like those decentralized exchanges, it is just to add a coin to the wallet but which might be scam coin, I do not see how it would lead to a compromised wallet. But I will always advice people not to joke with their main wallet, they should not connect it to anything or use it for airdrop.