Nobody can really help. You have to do your homework. What I found to be the best is looking and reading through official website, read whitepaper, hang out with community in discord groups etc. by asking relevant questions that you don't really understand. You can pick top coins and start from there, even if you hate reading you can go to YouTube and find relevant information where some people read the whitepaper, the idea behind crypto/project and presented you in the nice way.
Pretty much. You have to read the whitepaper yourself and draw a conclusion from that on your own.