I came across-Calculus Made Easy by Silvanus Thompson,on someones twitter feed. Published in 1910 and far less scary and far more interesting to read than a lot of math text books.
“Considering how many fools can calculate, it is surprising that it should be thought either a difficult or a tedious task for any other fool to learn how to master the same tricks.”
I really wish technical books were still written like this. Though if Thompson posted this on HN as a comment he probably would have been downvoted.
https://www.gutenberg.org/files/33283/33283-pdf.pdf