Math from scratch for a 22-year-old guy?

Question

Mathematics

Situation: I knew the school program at the Olympiad regional level of the class until the 9th, when the class became with a historical bias. Then he entered the programmer - and a fun life started.
The understanding of what is happening has evaporated from about the level of boundaries, difurs, trigonometry (arithmetic of sines / cosines / ...) and derivatives.
Now I decided to take up my mind (in particular, it stimulated the desire to do neural networks).
Problem: to find suitable material in "simple words", so to speak. So that the explanation is not at the level of the third doctoral, but with chewing "why and for what", because in life the brain is used to sifting out information that cannot find practical application.
Many thanks for the good books / resources and problem books with detailed solutions (not just answers, but with a step-by-step explanation).

Answer 1

Chew, don’t chew, but without a base you still won’t understand anything ...

Answer 2

Take a textbook or download its electronic counterpart and TEACH! Believe it should work

Answer 3

Read Courant "What is mathematics"
www.ozon.ru/context/detail/id/142250958
If everything is clear, then the first volume of Pantaev
"Mathematical analysis with a human face" as you master these two books, you yourself will understand what you need to study further. These books have a very high-quality presentation, the calculation is for an "educated amateur", in order to understand them, you need to think and solve problems properly. As for discrete mathematics, it is now easier to study it in online courses: Raigorodsky's "Combinatorics for Beginners": https://www.coursera.org/learn/kombinatorika-dlya-... His "Probability Theory": https: //www.coursera.org/learn/probability-theory-...
"Discrete structures" by Dainiak: https://stepik.org/course/Discrete-structures-83/