While commercial textbooks exist, many universities publish open educational resources (OER). Searching on platforms like the Open Textbook Library will yield several comprehensive PDFs on critical thinking and reading strategies that are free to download and use.
: A project of the Internet Archive that allows users to "borrow" or download over a million titles, including modern textbooks like The Power of Critical Thinking and various test preparation guides. critical reading books pdf free
You do not need money to become a critical reader. You need a system. You need curiosity. And you need the right PDF. You do not need money to become a critical reader
Learning to spot errors in reasoning and rhetoric. And you need the right PDF
Attacking the person making the argument rather than the argument itself.
Considered the gold standard of reading comprehension. While the full revised version may require a library login (via Internet Archive), his core essays and guides on the "four levels of reading" are widely available as free PDFs. Where to Safely and Legally Find Free PDFs