Is internet poker safe?
Let's deal with this question by breaking it up into more specific questions.
First, is your online poker money safe? If you are smart enough, yes. Choose only well-established poker web sites so you won't have any problems. The only time players have trouble with poker rooms stealing their money is when they sign up at a brand new room no one knows about.
Can you trust the poker web site with your financial information? Again, if you deal only with established sites, you should be fine.
Can other players hack into your account? Now comes the real problem. All that protects you from an online thief is your password. Keep in mind that your username is public information. Remember to always choose a very strong password. This would be one that has both lowercase and uppercase letters, as well as numbers and symbols in a random order. Be very careful who you trust with your computer if you save your password on it.
Never, ever give your password out to anyone, especially online. If you are very careful with your password, you will never have a problem.