Hello, world!
Step-by-step guide to creating the legendary Hello, world script in C# and setting it to run on a hotkey press.
Hello, World - Printing the Legendary Hello, World
You can import the ready-made example from here: Hello, World Example
Creating an Aura
Well, a screenshot is a must here, sorry.
Creating a C# Script Action

Typing in the Code (in some fresh versions, the newly created script may already contain this code)
Log.Info("Hello, world!");
Pressing Run

Voila!

Congratulations, this was officially the first step towards mighty scripts of the future.
Oh, Manually Clicking Run Isn't Cool
To make it a bit more interesting, let's set up our script to run only when a specific key, for example, F1, is pressed.
Adding the HotkeyIsActive Trigger to the Aura

Switching it to Click/Hold mode and specifying F1

Click/Hold is used to deactivate the trigger immediately after pressing. So, by pressing F1 twice, we will execute our script twice. The Toggle mode would toggle the trigger on and off with each press. Since our action is in the OnEnter block, pressing twice would execute our script only once.
That's It!
Now, every time you press F1, your script will print in the Event Log. Of course, this might not be the most exciting thing we can do, but more on that in the following examples.