For most people (myself included), gambling at online casino's is a harmless pass time fun activity, but of course it can become a problem for many. IMO, to lessen the risk of becoming a problem gambler, there are certain things i bear in mind such as,
- Gambling for Fun - Not to Win Money

- Setting myself a gambling goal
- I Bet small (don't blow all your money at once)
- I practice gambling with friends

- Set time limits and walk away

Many of these are easier said than done of course but it might be worth noting. Online gambling is probably the best thing to happen since sliced bread

and i'm not saying these points could or would work for everyone but they might help in enjoying gambling in a healthy, financially sensible way.
I'm interested to know how you keep tabs and control on your gambling to make sure that one does not become a compulsive gambler or problem gambler. if you are a newbie going in an online casino you might fall into the habit of running after profit, you should first watch it with your friends who are a responsible gambler, so you will learn how to handle the game, how to bet stop when winning or losing, this is important it will set your habit.