The best thing is first to read about Ethereum before you invest. It is a rule for every altcoin before you plan to invest. But it is a good plan! Ethereum should be in every portfolio.
Nice advise very rare and not been tackled here lol.

Investing is not just a game because this risking your money,so making research and deep understanding about the currency you want to buy is indeed.

But of course buying ranked coins will always be safer than shitcoins that needs Pump and Dump.