This is non exhaustive list of resources that I found to be useful in learning game design!
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The Psychology of Video Games by Celia Hodent
Serves a good introduction into how people think about games. The second chapter about UX designers and how they test and design, I found particularly interesting!
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50 Game Camera Mistakes
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Spatial Communication in Level Design
Probably one of the most concise and comprehensive explanations of space in level design you can find!