I'm a big fan of diversity, so apart from holding bitcoin, I go with Gold too.
As for the money earning part, I prefer passive/dividend based stuff over anything else, so check the market for legit looking projects/icos. there are some.
Putting up money into gold would somehow a good investment if you think for passive profits but doesnt guarantee you anytime on such gains. Any investments do have risk. Projects and potential ICOs might give you decent profits if you luckily find a good one and you would really gain decent profits with it.