START: weird edges, no accounting for textures
GOAL: clean edges, involved textures
ERASER TOOL: Erases current layer only
BRUSH SIZE: Makes brush size of current tool (including eraser) bigger or smaller
BRUSH HARDNESS: Gives brush a 'hard edge' (high) or a 'hazy, soft edge' (low)
BRUSH STYLE/SHAPE: Changes outline/shape (or other qualities) of current tool (example: grass brush)
The following video may be watched in its entirety, paused and followed step-by-step, skimmed our jumped through, or skipped altogether, depending on your familiarity and comfort level with getting from the 'START' to the 'GOAL'.