Introduction to Real Analysis
Coursera
Coursera course: Introduction to Complex Analysis
More resources on Integration
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia from Wolfram that provides detailed articles on mathematical concepts, formulas, and theorems, including extensive entries on integration and integration techniques.
ocw.mit.edu
MIT OpenCourseWare provides free, openly licensed MIT course materials—lecture notes, videos, assignments, and exams—for a wide range of subjects. It includes math and calculus courses, making it a solid resource for learning integration at your own pace.
Real Analysis: Modern Techniques and Their Applications
Real Analysis: Modern Techniques and Their Applications - A book resource
khanacademy.org
Khan Academy is a nonprofit online learning platform offering free, high-quality video lessons and interactive practice across math, science, and more. For calculus, it provides comprehensive integration tutorials, step-by-step solution videos, and related practice problems.