Do your "homework" to find the "hidden diamonds" nobody else has found yet;) That's the secret sauce... It is simple: the upside potential in good, yet undiscovered new ones is much greater than in the established ones. Upside multiples can be a totally different game. You just need to do your research carefully and don't trust ICO listing sites etc. because ratings can be bought. Careful research is very important to avoid scams and other low quality projects - don't trust anyone but your own research!
There will always be people trying to tell you that one altcoin is the future of money, a one way ticket to the moon, liquid diamond, a license to print money, blah blah blah. rainmonsoon is right, you need to read for yourself and learn. You don't know the truth until you dig, and if you can't find any information, there probably is no truth! Take the time to look at everyone involved and rank their trustworthiness on a piece of paper out of ten. Then you'll have a better understanding of your willingness to get into the risk.
A little bit of research can find you a lot of information. Also be aware that there are always negative spammers around too who like to stain the names of successful people too.