Bitcoin is main cryptocurrencyon the motion of which all are guided. I think, that can invest in bitcoin and all top crypto-currencies, because are at the beginning of long journey, but the main thing is not to expect a quick income from them.And it's an investment and need a lot of time to get profit. And the main thing is invest free and non-debt money.
My opinion about this topic is that bitcoin investment is more risky thing compared to typical investment for instance bank investment which I think safer than it. But along with the risks involved in bitcoin investment it offers higher profit in return.
If you're thinking for short term invest like two or three months than it won't work. You have to invest at least for a year.