I was confused with few things like how to trust any crypto currency(Small cap Coins)? was TA enough?
I don't see how you can determine a project's trustworthiness through TA.
This statement made me more confused as the person or team behind BTC is unknown but, still people believe in it. If so then should I be worried about the team in case of other coins? So., Confusing
The people working on BTC, specifically bitcoin core, is not unknown. You can even see the contributors to bitcoin core's code in their GitHub repository[1]. Only Satoshi Nakamoto, bitcoin's inventor, is unknown; not the teams that are currently working on bitcoin.
[1]
https://github.com/bitcoin/bitcoin/graphs/contributors?from=2018-01-01&to=2019-05-04&type=c