Get to know the projects first - its team, the idea and if it actually needs the blockchain technology. If it does then see their roadmap and proceed with your investment.
most challenging moments that we may ever had to decide which currency we should choose for so that is why for me i always check for the group of people behind that cause if that group had been experience lot of successful then there is a possibility for their next project that they may manage too.
Suggesting you to stay away of the market if you are a new comer and do not know about the market. Make experience with Altcoin or Litecoin for short term with continuous processes so as to get experience. But read the market before starting with Altcoin too because loss is possible here as well but I prefer it because it has lesser loss as compared with other best coins.