All online casinos have common features - features that are repeated from site to site. Some of them are normal and expected, others are a little insidious. If you understand how they work, the chance of "dumping everything" decreases, and the pleasure of the game increases.
In all games, even the most honest, the casino has a mathematical advantage. This is called RTP - Return to Player (return to the player). This is not a guarantee every time, but in the long run - that's how it is.
Each casino lures with bonuses - no deposit, free spins, 100% on the first deposit, etc. But there is always a wager - wagering requirements. For example, a wager of x40 means that you need to wager the bonus funds forty times before you can withdraw them. The lower the wager, the more likely it is to win something.
All casinos require you to create an account. And to withdraw money - they will ask for documents: a passport, a selfie, sometimes a bank statement. This is a standard, and it is needed for security and the fight against fraudsters. If a casino doesn't require verification at all, this could be a red flag
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