If we are talking gambling only (not poker, where your skills can actually make a huge difference), then the answer is - yes, but if you are very smart about it.
The thing is, online gambling on its own will not make you money, no systems, martingales or whatever else will make you a rich person. You may run hot for a while and win decent amounts of money, but in the end, you will lose; it's a simple math.
However, one thing that can help you win online is taking advantage of bonuses, which can be very generous on online casinos. If you pick reputable places and good bonuses and have patience to play them right, you should have an edge and actually win some money.
The thing with these bonuses is that they usually have high play-through requirements, so you will need to find a game which offers the least variance, for example a slot which is set in such manner that it doesn't pay out big, but pays small and very often.
So, in short, you can come out ahead for a while if you play your bonuses right. Other than that, it is just gambling 101, every time you bet a $1, you lose a certain fraction of that dollar, regardless of any individual outcome.
Online gambling is quite safe and easy way to earn some money nowadays. Still, you should find some trusted resource. I can recommend using bovada online casino play.google.com/store/apps/details which is a good way to make money while you are traveling or watching your favorite sport. There are a lot of different information about sport matches etc. Best of luck
