This explains how to change brightness of vector in illustrator by using recolor artwork
Learn how to create color palette in illustrator from a photo. There are mainly two ways to extract colors.
This article explains how to use the arc tool in illustrator. The two ways to draw precise circular arc is explained. The full circle is drawn using the arc tool as an example.
This explains how to delete objects outside the Illustrator artboard. Also, the export methods of your vector drawing are shown. You can export your file as a raster image or vector file using these methods.