Ridgetop
Herd Master
One thing I learned watching YouTube videos that weren't even remotely about circular saws but they were being used was you can use a metal speed square on boards up to 7" wide as a guide for the saw. I never even thought to do that but it makes for a nice straight cut, don't even need to draw the entire line with a pencil.
Is the "speed square" the long meta straight edge that clamps to the board as a cutting guide?
I didn't know that was its name. Here we have other professional sounding names like "clampy straight thing".