The execution table is what you look at most when you are working with the debugger, it shows each line of code that's been executed, as well as the value of a number variables on the right of the code, which represent the value of the variables after the execution of the code.

The 'step' column shows the number of steps it has taken the program from the first instruction to get to this point. The 'line' column indicates the line number of the instruction in your .py file. The 'instruction' column shows the text of the instruction. To the right of the 'instruction' column, there are a number of columns each with a name like 'var:some_var' where some_var can take on the name of any variable you would like to watch.

Whenever the debugger is open, running a command in the command window will cause the debugger to start running -- which means the execution table will fill up with rows as instructions are ran in the program. When the command finishes running, the rows remain there in the execution table for you to take a look back (you can always scroll up) at what has transpired.