If you want to invest securely, buy bitcoins. But most likely you will have to wait a long time.
Want a quick profit - participate in the ICO. But there is no guarantee that the project SCAM and you can lose all your money.
Well, cryptos in general are very volatile, Bitcoins can hardly be called a secure invest. Of course, ICO are even more risky...
If there are no other cryptos already in your portfolio, I'd suggest put 80% of your money in some top 10 coins and with the rest go for some more risky ICOs or low cap coins