The camera display doesn't look like the video
Are you following the instructions in the videos but the display looks completely different?
For example, you're expecting to see "AF-S" in the lower-left corner of the screen to show you're in single-shot autofocus, but you don't see it at all?
First, cycle the DISP/BACK button to cycle through the displays and see if this brings it up.
If that doesn't fix it, are you using Large Indicators Mode? The displays will be completely different if this mode is on. This is found in the SET-UP > SCREEN SETTING menu.
All display examples in these courses are shown with Large Indicators Mode off.