Today I learned two lessons (which may be second-nature to the sharper members of this forum).
First I learned to check the squareness of my miter saw cuts occassionally. Somehow the fence got a bit out of adjustment. Not too much damage done.
Second, I learned to think about available materials when planning a project. I'm building drawers for storage in my workshop. I laid out several different drawer heights (vertical measurement) to accommodate a variety of different tools. Today I started scrounging through the scrap pile looking for a drawer face that would be four inches high. I had plenty of old 1x4 pieces that would have been perfect if I had made the drawer opening 3 1/2.
What have you learned lately?