Free spins or bonus money
Free spins suit slot players and come with a fixed spin value on named games. Bonus money, usually a percentage match of the first deposit, can be used more widely but carries heavier wagering. Pick the type that matches what you would play anyway.
Work out the cost
A worked number: a Rs 10,000 bonus at 35x means Rs 350,000 in bets. On a slot with 96% RTP those bets cost about Rs 14,000 on average, more than the bonus. An offer with 20x wagering on the same Rs 10,000 costs about Rs 8,000 to clear and leaves roughly Rs 2,000 of value.
Keep stakes small
Most bonuses have a maximum bet while wagering, and one stake above it can void the bonus. Smaller stakes also stretch the balance over more spins, so a single bad run is less likely to end the attempt.
Withdraw when the wagering is done
Once the bonus turns into cash, withdraw it rather than playing it back. That locks in the result and tests the casino's payouts at the same time. Upload your ID early so the first withdrawal is not held for verification; see why new casinos ask for ID.
Risks
Offers can exclude whole countries, and a bonus does not change the law where you live. In Pakistan online casino gambling is prohibited, and the Prevention of Gambling Act, 1977 covers players too.