So little time….
Take a look at this site. OnchainFX
There are hundred of coins, each with its own identity and reason to exist (on most cases just scams but that is another topic for another day).
If you want to buy, the best option is to read each Coin description, check the developer team behind it and check for the community either on Reddit or Twitter.
One easy way to look for all the info above in one page is Crypto Primer
Take a look at it, it really impress me the amount of info available and the amount of coins in there.