So i was going through this course and i about lost my mind because of not being able to weight paint and i didnt find anything in this section that addressed my issue. There was one but it was something different so I wanted to share. In my version of blender you have to change the brush to subtract AND have a value to remove weight. Just putting it to 0 will not work on the Add brush or subtract. No brushes will work at a 0 level. I about lost my mind but i found it yay.
