Productive day with the teenage son. Taught him how to walk mount shelves and we installed a security camera system. Anchor bolts, drilling into masonry, mounting, levelling... And then we got on to staining some wood. I told him how it's done and then let him attempt with some adjustments and demonstration after he attempted. No one taught me that as a kid. It was all trial and error (pre-youtube days) or a neighbour. More than the work done was the sense of accomplishment he displayed.