The simplest and most understandable courses, video tutorials, articles and textbooks in mathematics in Russian?

Question

Mathematics

I found at the moment:
Courses:
School course up to grade 10
● spaceMath (grades 1-6, the project is abandoned)
● Stepik Basic course for preparing for the OGE in mathematics (grades 6-9) a wonderful course, just a couple of stupid tasks
School course 10- Grade 11
● Didn't find anything
I would be grateful if someone could advise how to fill this gap.
Higher Mathematics
Combinatorics
● Stepik Fundamentals of enumerative combinatorics (I stumbled on it, almost nothing is explained and difficult tasks are given - I do not recommend it)
● Сoursera Combinatorics for beginners
Probability theory
● Stepik Probability Theory
● Coursera Probability Theory for Beginners
Graph Theory
● Stepik Fundamentals of Graph Theory
● Stepik Fundamentals of Discrete Mathematics (Combinatorics, Graph Theory, Discrete Probability)
● Coursera Graph Theory
Theoretical Computer Science
● Stepik that there is not enough mathematics
I can’t imagine further study, I would also like to understand the theory of automata and statistics, get acquainted with the mat. analysis.
Video Tutorials
● GetAClass
● Lectorium ● KhanAcademy Russian ● 3Blue1Brown (in English, but with subtitles you can understand something) Sites, reference books, articles: ● mathProfi disgusting design, poor structuring Books: ● Found nothing. I would be glad if someone advises 1-3 books, not stupid textbooks, but not reasoning about mathematics. And simple and understandable explanations of how it works, what topics, basic concepts and tools.

Answer 1

spaceMath is not abandoned, new ones are rarely added.
From books
https://www.ozon.ru/context/detail/id/143245737/?_...
https://www.ozon.ru/context/detail/id/155341838/?_...
https: //www.ozon.ru/context/detail/id/144321914/?_...

Answer 2

I recommend to drive in the search engine "Soviet textbooks in mathematics"