Ask HN: Best resources to gain math intuition?

In high school I did the lowest tier maths and then jumped in the deep end by doing a year of electrical engineering. I’ve now done those harder math classes but I feel like there’s holes here and there. I think when I took physics it really brought out these flaws and lack of intuition.

Would anyone have a good resource for building this up?

Thanks

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/

3Blue1Brown videos are awesome:

https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw

Polya How to Solve it

If you mean "gaps in my education" or "basic things that I don't quite understand", you could try studying some high-quality texts. Look for books written by extremely smart people who are trying to explain the ideas rather than taking you through the standard topics. Hamming's books on probability and signal processing and Strang's books on linear algebra and applied math come to mind.

Alternatively if you're really interested in intuition, you could also look at the Math Olympiads. Pick a problem, beat your head on it, finally look at the solution, repeat. There are web sites and prep books.