testautomationu.applitools.com
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Test Automation University by Applitools is a free online learning platform for test automation and QA. It features video lessons, modular courses, and hands-on labs covering tools and practices such as Selenium, Appium, and visual testing—skills applicable to game testing.
More resources on Game Testing
GameDev.net QA Forum
Community discussions on testing tools and methods
gamasutra.com
Gamasutra is a long-running game development resource featuring news, features, tutorials, postmortems, and industry insights across design, programming, art, audio, and production.
Game Testing: All in One
Game Testing: All in One - A book resource
Game Development Essentials: Game QA & Testing
Game Development Essentials: Game QA & Testing - A book resource
ministryoftesting.com
Ministry of Testing is a community hub for software testers, offering articles, courses, events (such as TestBash), podcasts, and an active forum with practical resources to learn and improve testing skills, including game testing.