Okay...
When it starts, file > new > Flash file (AS3)
Press F9
Type:
trace("Hello World!");
Anything inside quotes is considered a string, a number of characters.
Now Ctrl+Enter
You get, 'Hello World!'
trace() is a built in method of AS3.
A method is a subroutine that executes a piece of code and can be called countless times. In this case, trace() outputs the argument (the stuff inside the parenthesis) to the output window.
If you do not know what a certain method does, highlight it and select help and Flash will show you the documentation for that method.
Also try some basic math in the trace like:
trace(5+5);
trace(5*5);
trace(5-5);
trace(5/5);
trace(5^6);
