My personal favorite is No Bullshit Guide to Linear Algebra - it gives a really good overview of math fundamentals and overall strikes a good balance between keeping things simple and giving enough insight to comfortably dig deeper in the topic.
Nice seeing you on HN. I thoroughly enjoyed the No Bullshit LA and Maths & Physics books. I wish more books would include concept maps, I find them a very useful tool for understanding how things fit in the broader picture.