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It's not wide-ranging but Terence Tao's Solving Mathematical Problems (https://books.google.com/books/about/Solving_Mathematical_Problems_A_Personal.html?id=ZBT
by Jun8 7y ago
It's not wide-ranging but Terence Tao's Solving Mathematical Problems (https://books.google.com/books/about/Solving_Mathematical_Problems_A_Personal.html?id=ZBTJWhXD05MC https://books.google.com/books/about/Solving_Mathematical_Pr...) makes you understand mathematical thinking better than any other book I have seen at that level.