Start with the paytable
The paytable explains symbol combinations and any special symbols. Wild and scatter symbols do not have one universal function across every game. Find out where a symbol must appear and whether a feature needs a particular combination.
Distinguish the stake from the balance
Before an action, identify the amount charged for that action and its displayed unit. A separate feature purchase can have a different cost. Check any confirmation screen instead of assuming that a large number on the page is the price of one spin.
Statistics do not predict the next spin
A published return-to-player figure describes a long-run theoretical measure, not a refund promised for a session. Past results do not guarantee that a particular result is due next. Choose time and spending limits before play and stop rather than chasing a sequence.