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the only decent guide/advice you'll get in gambling are don't gamble what you can afford to lose, don't chase your losses, gamble moderately, discipline yourself, properly manage your funds, do not treat it as a way to earn profits. if you want to understand the risk there are a lot of articles on the internet about what can happen to someone when they started gambling.
Yes, these are definitely right. And among the most important thing is to check and select a credible and legit gambling site. Beware of the new gambling sites, and to those that does not have an established reputation because it is too risky to play with those sites. So, do your research and do not be decisive.