When it comes to learning linear algebra, the resources by Professor Gilbert Strang (MIT) are widely considered the "gold standard." While his textbook Introduction to Linear Algebra is famous, his (often distributed as PDFs accompanying his video series) offer a concise, geometrically intuitive roadmap to the subject.
For older editions (e.g., Strang’s 3rd and 4th editions of Introduction to Linear Algebra ), the Internet Archive (archive.org) sometimes holds borrowable digital copies of the lecture notes prepared by teaching assistants. While you cannot "download" these permanently, you can read them online legally. lecture notes for linear algebra gilbert strang pdf
Note: These notes are widely circulated in PDF format and serve as the primary study material for MIT Course 18.06, available through OpenCourseWare (OCW). When it comes to learning linear algebra, the