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.
You can search the github accounts of these coins so that you will have a good idea of their development activities,i personally wont join/buy if the team doesnt have good development activities,because fundamentals has good impact to the market price of each coins and projects.Whitepapers and roadmap should be checked as well.