I used to think a speed square was just for marking 90s, but a framing job in Bend changed my mind.
I was cutting rafters for a shed roof and my angle finder battery died. My buddy just grabbed my speed square, showed me how to use the pivot point and the degree markings on the edge, and we laid out the whole pitch in like two minutes. I felt pretty silly for not knowing that trick after 8 years in the trade. What's a basic tool trick you learned way later than you should have?