The only great way comes to mind to earn bitcoins is from trading as I don't see any other better way to make good amount of bitcoins in quick time and which will also grow your bitcoins over a period of time.
The best way to make bitcoin as a less technical way is through trading because with limited knowledge one can easily make it big in it. All you just need to do is buying bitcoin and others coins like creditbit,eth, dash and rippe and hold them for long time and sell them for profit.
I agree with you that trading is one of the most profitable way to make bitcoin rather than anything but trading needs time and patience because it is not that easy to make money with trading, you need a lot of time in studying and a lot of patience also, for holding coins so you can earn decent amount of profits from your holdings because the most secret key for this field is patience then if you don't have that then you are already a loser.