A theme or jackpot headline tells you little about the rules. Open the game information panel before you play and check the stake, paytable and bonus mechanics.
RTP is not a session forecast
Return to player is a theoretical long-run measure. It does not tell you how much you will get back in a particular session. Different versions of a game may use different settings; read the information in the version you actually open.
Volatility changes the experience
Volatility describes the pattern of payouts, not a reliable route to profit. Long losing runs can happen. Never increase a stake to recover a loss.
Check whether the game counts
Bonus terms may exclude games or count some wagers only partially. Progressive jackpots and special features can have their own conditions. A familiar title does not mean familiar rules.
Set the stopping point first
Choose a time limit and an amount you can afford to lose before starting. A demo uses virtual funds and cannot predict how real-money play will turn out.