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Chegg offers subscription-based homework help, tutoring, and textbook rentals with coupon codes for savings. The article lists current deals including unlimited access for $19.95/month and a free trial.
ChinaTextbook is a GitHub open-source project that organizes textbook PDFs from primary school to university for free download, making it convenient for parents and students to access digital textbooks.
The author discusses the lack of detailed, complete proofs in advanced mathematics textbooks, which creates unnecessary barriers for students and professionals, and advocates for the creation of more accessible accompaniment notes.
This project open-sources Chinese compulsory education math textbooks, aiming to popularize education and help overseas Chinese children learn.