RE: What would You advise a Newbie to Invest in?
I don't invest in things I don't understand so I'd tell him to do a little research on Bitcoin and Ethereum. From there if he wants to investigate coins you recommend him, he would be much better off.
If he doesn't want to do a little research, he probably shouldn't be investing.
I would personally get some exposure to BTC or ETH before anything. I'd buy Hive if I was interested in the community, if not I would not. I'd probably look at Steller or Vechain. Litecoin is too similar to bitcoin so whether or not it survives depends entirely on name recognition...It could do great but I'm a little uncertain. Cardano is my favorite out of those 3 you mentioned. He should probably know what a smart contract is and know something about it though....
Dollar cost averaging is a great strategy, I'd probably rotate between BTC, ETH, and one or two other coins that are higher risk, but learning about them beforehand.
Not financial advice :-P