Murphy’s Oil and Palmolive Dish Soap: great suggestion by Sharon Barfoot for cleaning oil paint off of brushes.
Blue towels from automotive section of Canadian Tire and hardware stores: recommended by Brian Atyeo. Terrific for rubbing fiercely on your canvas or board. Washable (although I have never washed mine).
“How to Sell Your Art Online” by Cory Huff. I am just getting started but like this quote in the book by James Allen: As a man thinketh in his heart, so is he.”