[pretty_good]

Pure Mathematics for Beginners by Steve Warner runs through the (very) introductory elements of major branches of math [0]. If you want even more leisurely intro to math intuition without worrying about elements of topology/abstract algebra or whatever, Book of Proof by Hammack is great and free [1].

[0] https://www.amazon.com/Pure-Mathematics-Beginners-Rigorous-I...

[1] https://www.people.vcu.edu/~rhammack/BookOfProof/

[crimsonalucard]

Like most people he's probably referring to applied math. It's really what most people outside of graduate students or math majors are interested in.