ocw.mit.edu
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MIT OpenCourseWare (ocw.mit.edu) offers free, openly accessible course materials from MIT across disciplines. You can find lecture notes, problem sets, exams, and sometimes video lectures for logic and mathematics courses, useful for self-paced study of propositional logic.
More resources on Propositional Logic
Introduction to Logic
This course is an introduction to Logic from a computational perspective. It shows how to encode information in the form of logical sentences; it shows how to reason with information in this form; and it provides an overview of logic technology and its applications - in mathematics, science, engineering, business, law, and so forth.
ProofWeb
Online logic tutor for propositional logic
forall x Logic Book
Free online textbook with propositional logic
Stanford Intro to Logic
Interactive exercises for propositional logic
Logic and Proofs
Learn propositional logic & mathematical proofs with this free MIT course. Master the fundamentals for computer science!
plato.stanford.edu
Stanford Encyclopedia of Philosophy (plato.stanford.edu) is a free, peer‑reviewed online encyclopedia of philosophy. It contains in‑depth, scholarly articles on a wide range of philosophical topics, including detailed entries on logic and propositional logic.