Setting a good saddle height is very useful, and perhaps the most important component of how a bike fits. It can change a bit for you over time depending on fitness and flexibility, so if things change, you may want to adjust again as time goes on.
The best height is a little bit below a bit too high. Sounds silly but it’s easier to tell when a saddle is too high. Your hips tend to rock side to side and you feel stretched and uncomfortable in the saddle.
It can be harder to tell if the saddle is too low. So to test it, try raising the saddle 1/8” or 3 mm and ride for a couple weeks. Then decide it it’s better or worse. If it’s worse, go back down. If it’s better, try another 1/8”. At some point you will find too high. Then back down and you should have the proper height for now.
Otto