How to understand mathematics and statistics?

Question

Mathematics

Good afternoon friends!
I started studying mathematics 5 years after university. Like many students at the university, I gave up on her, not suspecting that in the future I might need her. Now you need to study mathematics and mathematics as soon as possible. statistics for further use in the field of big data. In one of the posts I found the book "Pleasure from X" - it completely turned my world and all understanding. I would like something similar but more "serious".
Actually the question is ... tell me resources or books, maybe some courses to study the above disciplines?

Answer 1

As books on linear algebra I can recommend the following:
1) Umnov A.E. Analytic geometry and linear algebra.
2) Beklemishev D.V. Course of Analytic Geometry and Linear Algebra I
studied them at the university. It is worth noting that they differ in their approaches to the subject: the first book was written from the point of view of algebra, while Beklemishev - more from the point of view of geometry.
Actually, comparing the two approaches will allow you to better understand the subject, so reading both books will provide the necessary theory. minimum.

Answer 2

We somehow prepared for a master's degree using classical textbooks.
Here is my question on the same topic.

Answer 3

D. Written in higher mathematics.
About interesting books by A.A. Bukhshtab "Number Theory"