I can see that you’re having a very hard time with texture painting and with this course. I’m sorry for the frustration.
While of course our courses aren’t perfect and aren’t 100% all encompassing, as no educational content is, please understand that computer graphics is a complex thing to learn. As is Blender a complex thing to learn. So please be patient, ask questions calmly and politely and we will do our best to ensure that you learn.