website
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When I brushed Zhihu, I learned about a good website that bypasses paid papers paywalls: Sci-hub
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A website that bypasses paid electronic books and textbook resources: Library Genesis
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Open Source Online Encyclopedia of Frontier Algebra: Index—The Stacks project
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When I brushed the column about linear algebra, I saw a website explaining the knowledge of linear algebra: Apocalypse of Linear Algebra , the author is a teacher from a university in Taiwan called Zhou Zhihua, known as the "God of Linear Algebra"
Update log:
2020-12-11 Added library genesis and the stacks project