guru99.com
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Guru99 is a free online learning portal with comprehensive tutorials and articles on software testing and QA, including manual testing, test automation, and common QA tools (e.g., Selenium). It offers step-by-step guides, quizzes, and interview questions to help learners master software quality assurance.
More resources on Software Quality Assurance
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Blog with advanced testing techniques and free eBooks, upvoted in practitioner threads
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Community-driven resources, articles, and free webinars for SQA practitioners
ISTQB Foundation Level Prep
Playlist for certification prep, top comment link in r/softwaretesting
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Software Quality Assurance: From Theory to Implementation - A book resource