The second lecture of the series is Lecture 3: How Aircraft Fly. Below are the notes (17 pages) that I made during this third lecture, composed of:
Lecture 3a: How aircraft fly
Lecture 3b: Lift
Lecture 3c: Drag
Lecture 3d: Thrust and weight
DelftX AE1110X Online Course: Introduction to Aeronautical Engineering (Week 1 - Lecture 3)