I started a thread on this a year or two ago here- NPR's Explanation of Lift- probably one of many on APC if you look around. Some other threads that come to mind recently are listed below.

Ground effect- Cessna Versus Piper Trainers
Ground effect- Lift in Ground Effect (II)
Lift on takeoff- When Lift Starts and Stops

I would talk about it some more myself, but I am very busy these days, and aerodynamics is my favorite subject. Don't feel bad if you have to struggle with it to understand. Top scholars continued to struggle with details of aerodynamics theory well into the 20th Century. They studied and researched the subject their whole lives- why should it be surprising how hard it is for us mere mortals.