Thanks, InkChris.
I was looking for some kind of assignment. Sometimes it is difficult to come up with a project. The on-line class gives me fresh ideas in the assignments. I wish I could remember my assignments in my Illustrator class from many, many years ago. They were designed for us to learn the tools. I hope that Brynn can give you a good sequence in which to learn them.
I think the Pen Tool is #1. When I wanted to get a refresher on the Pen Tool, I went to Google search and looked for children's coloring pages. I imported them into Inkscape and traced them. They are usually simple line drawings with straight lines and curves. Big block serif text is also good to outline with the Pen Tool. This tool and the Edit Tool are important for both creating and manipulating linework/paths. Precise paths are vector applications biggest strength. The Edit Tool has a lot of options. That is good. That means it is powerful.
Next, I think are the Shape Tools. You want to know how to change them into paths.
Assigning Fills and Strokes are something to learn early.
Layers are also important to learn up-front with simple projects. They will become very important in more complex projects. They not only help you organize things, but you can lock, duplicate and hide layers. You can create different versions of parts/pieces of a design, and then turn them on and off to see which you like better.
Gradient Fills and the Gradient Tool for adjustments are also some things you want to learn early.
You also want to know how to use the Preferences window to set up your workspace specifications.
Next, I think you want to learn the Path Tools like Union, Intersection, Difference, etc.
I do remember one of my first Illustrator projects was an ant. It was good fairly simple project for linework/paths and for gradients/shading/highlights. And, since it didn't have a lot of parts, I learned to use layers.
I hope this gets your creative blood pumping because Inkscape is so full of features and powerful. It may seem overwhelming. But, once you start a few projects, you will learn tools and processes because you want to know how to do something like, for example, outlining parts of an ant, and then making the body parts look 3D with gradients. That reminds me: I'm sure you will want to learn how to import a bitmap image like a photo of a drawing you made to lock on a layer and use as a guide.
Best of luck. Hope to see your work here. Don't be afraid to post it and to ask for help. That's what people are here for. And, ask questions...especially to Brynn.