Listening to these lectures on critical theory and reasoning by Marianne Talbot has been so much more enjoyable and enlightening than any of the standard textbooks on the subject that I have read.

https://mariannetalbot.co.uk/critical-reasoning/

The site contains the podcasts of a number of other lecture series by Professor Talbot including philosophy for beginners, formal logic, causation, and ethics. I have only gone through the critical theory lectures so far, and recommend it to anyone who wishes to get a clear understanding of the basics of the subject. I wish someone had pointed me to this page much earlier.