BTC and ETH are the "safest" bets right now. LTC has been really steady and is probably the most sensible investment, but will probably not take off like BTC did.
BCH (Bitcoin cash) is the newest fork of BTC and has been volatile but has a lot of people backing it. I would look it to it at least.
I've been keeping an eye on EOS and DASH but not really sold on them yet.
Biggest advice I can give is - don't let FOMO guide your decisions. Diversify your portfolio and don't micromanage it or keep an eye on the charts all day. You'll drive your self mad.
Also - don't expect to make ANY money of crypto. It's a gamble, like a scratch ticket. Only invest what you can absolutely afford to lose, because chances are you will.