How do you do your own research if the coin is a good investment?
For me, I always look on the purpose of the project, the team behind it, what exchanges is it available on etc. And one of the important thing for me is the total supply of the coin.
I also research if the coin is Proof of Work (POW), Proof of Stake (POS), Pre-mined or other.
I do not particularly see the technology on which the blockchain of the currency is built. Especially I do not trust the new technologies. For me a good currency it is a currency that has already proven itself on the market.