Regarding your statement that many people need tutorials about Testnet and Airdrops, I do not think this forum is the right place, because Testnet and Airdrops are full of scams and the forum does not encourage them at all.
The Testnet is mainly for experimental and educational purposes but unfortunately some scammers use Testnet coins to scam and defraud beginners.
Yes, many airdrops and testnets are scams. That is where research is important, and my existence as a researcher. Likewise, like investing in altcoins, of course many alt coins are scams, but we need to do research before investing. Right?