I suggest you invest in btc or eth because both of they are the most stable coins in the market. Other than that i'm not so sure. Btc and eth have been a pioneer in this crypto world, so if i were you, i would invest my money in the top 3 of the market.
A beginner should not limit investments to only 2-3 coins, it is better to have more of them several times, especially in the top full of quality projects that have successfully survived the last year