Annotations will appear as you listen
NASCAR is a type of car racing that happens mostly on oval tracks in the U.S. The cars look like regular cars but are specially built for racing.
The '24 hours of limits' is a long race where cars drive for a full day, and the goal is to go as far as possible in that time. It's a test of speed and endurance.
A full course caution means all the cars have to slow down because something happened on the track. It's a safety measure to keep everyone safe while they fix the issue.