Of course bitcoin is the heart of all coins because all crypto market is up if Bitcoin is up and if Bitcoin is down then market is down. Bitcoin proved itself and it's potential is great. So why it is the heart of all coins.
Many people are taking crypto as a full time job there is nothing bad in that. If you will do crypto market with full interest and with excellent study you can take it as a full time job and you will definite succeed.
Well I agree that bounty hunters dump always but there is nothing wrong because it is very good strategy if you hold your coins with patience then you can get extra profit.
To know about the good coin you have to collect all information about that particular coin like read all the information about the project in website and white paper, study about the team of developers.
I did airdrops and i earn some coins but when i did bounty and all camps of bounty then earned more coins and i am so happy with that . I think both are the best at own way airdrops have less task and bounties have more task and more coins.