Spivak's Calculus & Calculus on Manifolds are both fantastic books to start with (they're named calculus but they're really more analysis) There's a Youtube ch

Spivak's Calculus & Calculus on Manifolds are both fantastic books to start with (they're named calculus but they're really more analysis) There's a Youtube channel 3Blue1Brown which is fantastic [1] as well. In fact, his videos are among the best if not the best for visually illustrating beautiful concepts in mathematics. The concepts covered are almost always widely applicable in problem solving and useful to know. He's got a wide variety, but the series on Calculus and Linear Algebra are good refreshers for the two main subjects applicable to real engineering. [1]: https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw