Admittedly, I see on the internet lots of online casinos, but I have no idea which ones are really the good sites because I haven't tried them! Some sites offer poker, slot machines, and blackjack, just to name a few. If you are interested about them (like an online friend who's really crazy about them!), then I think it's a good idea to try and read up those reviews being offered.
Of course, that doesn't mean you're going to be a pro once you've learned a bit, so you should just read/do some research if you have the time, before going all out and betting. BobGambling.com is one such site that can help since they not only have a list of some of the trusted online casinos to date, but also related topics about online gambling.
As for me, I will always remember what my online friend told me: don't bet unless you're sure that you want to! That's a pretty neat advice, don't you think so?