To add to this, a website I've found useful is betterexplained.com. Specifically for complex numbers, take a look at [1] and [2]. But they also have good articl

To add to this, a website I've found useful is betterexplained.com. Specifically for complex numbers, take a look at [1] and [2]. But they also have good articles with visualizations to help you understand the Fourier transform, the number e, integrals and derivatives, linear algebra, etc. A starting point is [3]. One useful idea is that they color the different parts of math equations to explain each part separately, see [4]. Another great source of math visualizations is the YouTube channel 3Blue1Brown, in particular the series on linear algebra [5]. (I didn't intuitively understand what a determinant represented or what the determinant of a transformation being zero really meant, until watching [6].) [1] https://betterexplained.com/articles/a-visual-intuitive-guide-to-imaginary-numbers/ https://betterexplained.com/articles/a-visual-intuitive-guid... [2] https://betterexplained.com/articles/intuitive-arithmetic-with-complex-numbers/ https://betterexplained.com/articles/intuitive-arithmetic-wi... [3] https://betterexplained.com/articles/developing-your-intuition-for-math/ https://betterexplained.com/articles/developing-your-intuiti... [4] https://betterexplained.com/articles/colorized-math-equations/ https://betterexplained.com/articles/colorized-math-equation... [5] https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2x... [6] https://www.youtube.com/watch?v=Ip3X9LOh2dk&list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab&index=6 https://www.youtube.com/watch?v=Ip3X9LOh2dk&list=PLZHQObOWTQ...