Initially I tried using a free vector art creation application known as Inkscape with my Gaomon PD156 PRO tablet, and it unfortunately does not work with the PD156 PRO as well as some other Gaomon tablets, so for an alternate vector art and raster art solution with a minimal cost: I found that Affinity Designer works great with my PD156 PRO!
Affinity Designer is a one time charge of $50 as opposed to Adobe Illustrator which is around $21 every month. I purchased Affinity Designer on sale for $25 off. There are also Affinity Publisher and Affinity Photo, both costing $50 each unless on sale for less, which are great beginner and budget minded alternatives to Adobe Photoshop. There are also trial versions of Affinity products available. Affinity is a great program to get started with the Gaomon for both vector and raster art if it is one's first tablet.
I am loving my tablet! Thank you Gaomon!