Get into a setting, doesn't matter what kind of light, in fact different settings under different conditions would be ideal. Now set the camera to P mode. Take a few shots of something. Notice the settings and jot them down on a notepad. Now change to AV or TV and do several test shots moving each way, up and down in Apt and shutter speed. Each time make a note on the setting used for each frame. Be sure to include the frame # with the notes.
Go home, sit down at the computer and look at the P mode shots. Now look at your experimental shots. See how the photo changes as you changed the settings? By using your notes you will be able to understand how a fasterslower shutter or smaller/larger apt can change the results.
Now go to the library and get a book on exposure techniques. You will better understand what they are talking about after doing this experiment and, if you have trouble comprehending what they are saying, use your experimental photos and notes to see what they mean.
On shooting sports...If you see it happen then you didn't get it.