Infinite series Courses
Ohio State University via Coursera Calculus 1C: Coordinate Systems & Infinite Series
Massachusetts Institute of Technology via edX 微积分二: 数列与级数 (中文版)
Ohio State University via Coursera Integral Calculus
Brilliant Advance Calculus
Dr. Gajendra Purohit via YouTube What Makes the Natural Log "Natural"
3Blue1Brown via YouTube Secrets of the Sum of Sums - Paradoxical Harmonic Series
Mathologer via YouTube Euler's Infinite Pi Formula Generator
Mathologer via YouTube The Proof - E and Pi Are Transcendental
Mathologer via YouTube Great Thinkers, Great Theorems
The Great Courses Plus