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Some courses provide cheap “textbook only” (you only get a textbook with no certification) mode.
This is learning content and here are the best online courses from Victor Porton's Foundation, a charity, presented by Victor Porton, the person who discovered ordered semigroup actions (and wrote 500 pages about them), a theory as general as group theory but unknown before. Victor Porton is a programming languages polyglot, author of multitudinous softwares and programming libraries, blockchain expert and winner of multitudinous blockchain hackathons, author of several books, a philosopher.