There is not a big issue with trust as long as you understand the technology you invest in and developers of the coin have proven themselves through hard work and dedication. It usually means the coin needs to stick around for a year or two before it can be put into the pipeline to be considered for investing. Both of these points mean that you don't look below Top 50 of www.coinmarketcap.com. Top 50 is all you need to wrap your head around, and I don't mean all of them, I mean these are the ones that have proven themselves, more or less, and you got to pick gems from them that shine for you.
I'd not follow that advise. Stellar or Ripple are for exemple not to be trusted for exemple. They're not even real crypto-currencies.