First things first don't INVEST blindly bt try to see why and where you invest your money. You can always look for big player coins such as ETH,BTC, which are somewhat must have at least portion in youur portfolio from my point of view. Next you want to grab something like IOTA, NANO, maybe even EOS as they have free transactions and people love free stuff so if they can use free or pay few cents majority will opt for free version I guess. You could also look at some privacy coins such as XMR etc.
If you however like to "gamble" and take higher risks might want to look at some low capped coins etc. All depends on you
DON'T BUY COINS JUST BECAUSE SOMEONE TOLD YOU TO DO SO.