Welcome Weylin!
Awesome, looks like you are off to a good start with the basics. I love Inkscape, and hope you will enjoy using it too. As a vector graphics program, it takes a little getting used to, especially if you're used to working with a raster type program like Paint.NET. But I much prefer it, and can't wait until MS makes Internet Explorer able to display SVG images.
Anyway, please see my signature for info on learning materials. And please don't hesitate to ask for help in the Help forum, if you get stuck or just have questions.
All best
