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Adobe Illustrator User Guide on the Adobe help website is a resource that can help with updates on software as well as help with problem-solving.
Illustrator is a vector-based software. Vector graphics are computer graphics images that are defined in terms of points on a Cartesian plane, which are connected by lines and curves to form polygons and other shapes. Vector graphics have the unique advantage over raster graphics in that the points, lines, and curves may be scaled up or down to any resolution with no aliasing. The points determine the direction of the vector path; each path may have various properties including values for stroke color, shape, curve, thickness, and fill. (Wikipedia, https://en.wikipedia.org/wiki/Vector_graphics, August 2020)