There is nothing wrong in investing into multiple coins in as much as those coins have future prospect. The whole decision depends on what you want from your investment. In my own opinion, I will advise that you take close study on those coins very well before you invest your money into it. Try to find out what the prospects of those coins are before you invest in them. Also, I will suggest if you can start with little coins and see how the profits will be before you think of investing in more other coins. Investment in coins that are of future prospects is a very lucrative business to venture into.
That should be the default action of each crypto investor so in case something goes wrong, he should know the reason why and it will be a good learning experience for him. One should not rely from others' opinions when it comes to investment. You should do your own studying and assessment of each and every coin. You can't blame others for what might happen with your money.