Pretty sure anything in trading involves some level of risk and I can't exactly say any of them is low in level. I'd guess the lowest you can get is either investing in Bitcoin (or any coin you think is going to last long) which yields better rewards in the long run imo, as well as mining coins yourself. There are still some level of risks but they're a lot more manageable compared to investing god knows how much in altcoins who are going to die in the next few weeks after release, or at least most of them anyway. You can try shorting them but that's not exactly low risk.