RTP is long-run information
Return to player is a theoretical long-run percentage, not a forecast for your session. A slot listed at 96% RTP can still produce very different short-term results.
Volatility changes the ride
Higher-volatility slots tend to have larger swings and less frequent hits; lower-volatility games tend to spread returns differently. Neither is a promise of profit.
Use the paytable
Read the rules, symbols, bonus features, maximum win and bet range. If demo mode is available, use it to understand the mechanics rather than to predict real play.
Protect the entertainment budget
Use a fixed amount, a time limit and a stop rule. Never increase a stake to recover a loss.
Keep a simple comparison note
Write down the operator, the date you checked it, the terms you accepted, your limits and the support answer you received. This small habit prevents a headline offer from becoming a vague memory.