Keep it Straight
Walk up to any tool in a shared shop and you are trusting whoever used it last. I walked up to the table saw and found the blade sitting about a degree off zero — which I discovered after I had already cut the parts for a tabletop. A degree does not look like much until the glue-up, when the panel comes out barreled instead of flat.
So the habit is a small one: keep a good 4″ square nearby, set it against the blade before you cut, and confirm you are actually at 90°. Same check at the jointer — look for daylight under the square on both the infeed and outfeed tables. The miter saw is harder to eyeball, but you can still see whether it is sitting on zero, and it is worth checking the bevel as well as the miter.
And the other half of it, which matters more in a shop we all share: when you are done, put the tool back to zero. The next person should not have to find your angle the hard way.
