The best investment I have made till now is keeping most of my savings into BTC. It gave me more returns than any investment plans till now with my savings. Of course it had more risks but my 6th sense always told me that BTC will grow.
This is the easiest way to earn without special knowledge and without much expense of your time.
Yes no hassle to keep your bitcoin that is the easy way of investment. To keep bitcoin while waiting the bitcoin price going up. And keeping bitcoin is the best one than to gambling or trading.