You can hold Bitcoin. I think there will be a big appreciation of Bitcoin in the future, but it is hard to say whether Bitcoin will be the second gold.
bitcoin can not be said to be a second gold because bitcoin does not have a production system as well as the gold they use nor is bitcoin centralization like gold investments there will be a control over their assets. However, it will definitely have their respective risk levels, because gold is more vulnerable to have a risk that can be forged, while bitcoin itself is very vulnerable to hacking.