You have to start somewhere, do your own reading.
This is a good read for beginner
https://mycrypto.guide/Airdrop coins are usually used as a means to attract people to join the project or build awareness so they may not worth much
Most are however borderline scam with no real development.
There are tokens based on different blockchain such as ETH, NEO, WAVES etc, for that you need different wallet. Also the wallet address should not be from an exchange.