There isn't a single "right" place to put your hands when making out, but here are some suggestions:
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Around the neck: Try slipping your hands around your partner's neck, using one to stroke their hair, or moving one hand to each place.
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Hips or Lower Back: If there's a height difference, you can always rest your hands on your partner's hips or lower back.
The key is to be comfortable, read your partner's cues, and don't overthink it.