Miscellaneous

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    BlackPenRedPen, a YouTube channel (https://www.youtube.com/channel/UC_SvYP0k05UKiJ_2ndB02IA)

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    Stephen Miller’s "The Probability Lifesaver" - a wonderful book on probability

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    Jiří Lebl’s "Notes on Diffy Qs" (https://www.jirka.org/diffyqs/diffyqs.pdf)

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    The American Institute of Mathematics maintain a list of open access textbooks of which they approve (https://aimath.org/textbooks/approved-textbooks/).

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    Ian Anderson’s "A First Course in Discrete Mathematics"

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    Philip J. Davis and Reuben Hersh’s "The Mathematical Experience"

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    I found Alan Schoenfeld’s "Mathematical Thinking and Problem Solving" interesting, but I can see why many other people might not.

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    Michael Steele’s \sayThe Cauchy-Schwarz Master Class.