Somehow as easy as it is conceptually, I still find cutting 3 stringers that line up well to be surprisingly difficult. In part because I’ve only has to do it a handful of times in my life.
I made a table. The legs are all exactly the same length, but don't ask me what that exact length is - I eyeballed the height I wanted and then clamped all the legs together before cutting them.
Another tip for building things with legs - a 3-legged object is stable on any uneven surface while a 4-legged objects will wobble on uneven surfaces.
This is because 3 points make a plane, adding a 4th point that is not on that plane introduces a wobble.
On a level floor, sure. But for something that will be on uneven surfaces, like outside, 3 legs are stable, even if the legs are all different sizes[1].
[1] Three points make a plane, the plane itself may not be level, but because all points of contact are on the same plane there is no wobble. When there are more than 3 legs, some points may not be on the same plane, producing a wobble.
https://www.blocklayer.com/stairs/straighteng, click "Show Notching Template", then "Diagrams to PDF"