Illustrator Stroke Tutorial

Note: This is not a tutorial on how to use the pen tool.

I made this tutorial for my sister who already has an understanding of the pen tool, but doesn't seem to know much else about illustrator. I thought this would be a great reference for her, but might help out other deviants as well, so I decided to post it. This is how I do the lines for a lot of my work, and I hope some of the techniques I use can help you too.