In the Posterior Analytics, Aristotle moves on from the study of formal rules of reasoning in the Prior Analytics to consider the substantive application of logic to produce scientific knowledge, something which he believes is the product of correct reasoning from true premises. This involves him in addressing Plato's Meno's Paradox, seeking to show how knowledge is possible from a position of former ignorance.
Free online texts
Bibliotheca Augustana: Ἀναλυτικὰ ὕστερα. Greek HTML text.
Internet Archive: L391 - Posterior Analytics & Topica. Greek and English Loeb edition.
Internet Classics Archive: Posterior Analytics, translated by G.R. Mure. HTML and text versions.
Online Library of Liberty: Posterior Analytics, translated by E.S. Bouchier (1901). Multiple formats.
The Logic Museum: Posterior Analytics, translated by G. R. Mure. HTML text.
University of Adelaide (Internet Archive): Posterior Analytics, translated by G.R. Mure. Multiple formats.
History of Philosophy without any gaps: Aristotle's Logical Works - podcast by philosopher Peter Adamson.
History of Philosophy without any gaps: A Principled Stand: Aristotle's Epistemology - podcast by philosopher Peter Adamson.
Internet Archive: Posterior Analytics - public domain audiobook.
Internet Encyclopedia of Philosophy: Aristotle: Logic, by Louis F. Groarke.
Librivox: Posterior Analytics - public domain audiobook.
Stanford Encyclopedia of Philosophy: Aristotle's Logic, by Robin Smith.
University of Houston: Aristotle's Posterior Analytics, Aristotle's Theory of Knowledge and Demonstration, by Cynthia Freeland.
University of Washington: Posterior Analytics: Epistemology and Philosophy of Science. By Marc Cohen.
Wikipedia: Posterior Analytics.
The Great Conversation: Further reading at Tom's Learning Notes
Ancient Greek resources: Learn to read Greek classics in the original.