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.
Every investment have their own risk and cryptocurrency have higher risk i think. Crypto have more risk because government regulation, we know that in many country, crypto still unregulated and prohibit. But if we believe on technology and crypto, i am believe cryptocurrency will give big profits in near future