Having some garden brushes in your life isn't going to make you a better gardener. They won't cause your roses to bloom better, or your borders to be more brilliant. They are unlikely to help you on the quest for a perfect lawn (if that's what you want out of life). You need advice and help from Gardeners Question Time or Gardeners World for those challenges.
However, what these garden brushes will do, is make your life a bit easier when you're gardening. They'll easily clean plant pots, your garden tools, your lawnmower, and even your nails after a busy day with your hands in the soil.