How to read what's going on...

Is there a table of content that helps with reading what the Numbers and letters mean with the flights? I’m puzzled with the “^” and “v”. Also the different colors, some aircraft are light green and some are light blue. Also the Square Blocks usually blue. Thanks… :confused:

The format is

Altitude Groundspeed

where altitude is in hundreds of feet and groundspeed is in knots. The ^ or v indicates climbing or descending.
As the bottom of the big map says, flights in blue are to/from the airport and flights in green are in the vicinity.
The square indicates the most recent position (so you can tell which way the track is going).