Pro tip: an old guy at a lumber yard in Tacoma showed me a trick with a framing square that saved my whole day.
I was picking up some 2x12s for a deck rebuild and looked totally stuck on a tricky angle cut. This retired carpenter, maybe 70, saw me staring at my phone and just walked over. He took my square, laid it flat on the board, and marked a line using the 7-inch and 24-inch points instead of the usual ones. He said, 'Kid, that's the 16.26-degree rake for your stair stringer, right there.' It was perfect. I'd been messing with an app for 20 minutes. Anyone else have a simple old-school trick that just works better than tech sometimes?