Delivery girl? Ones in Christmas cloths or the pink haired one with Mac and Harleen.
I first tried Game maker but had no idea how to make games using it. Searching online found about Unity Engine. There were lots of tutorial explaining how to use it, so Game maker was replaced with Unity.
Most of the things I have learned about Unity and C# are from YouTube tutorials or reading UnityAnswers forums. I play other games only figure out how I would make that mechanic working.