As for an additional source of income, I think trading is great for this. Trading doesn't take a lot of time, I only spend 2-3 hours every day. At the same time, the income is very good. I advise you to start by choosing a broker at http://usforexbrokers.com/compare/td-ameritrade-vs-oanda/ because this will really affect the outcome.
Especially in trading with this you need to be quite careful. It is very important in any investment not only to increase your earnings, but also to save capital.
I recommend everyone to try your attention here on this website and their reviews about scam brokers like Aurora Coins https://scambrokersreviews.com/forex-scams/aurora-coins-detailed-review/ because just here I always have to tips how to find a true broker who will always help me make money, and will not dupe me.