If you are interested in learning how to adjust saddle height on a guitar’s bridge to improve the action, I would recommend starting by watching one of these videos:
Adjusting Electric Guitar Saddles
For electric guitars:
Adjusting & Lowering Acoustic Guitar Saddles
What Is The Ideal Saddle Height On A Guitar?
Most would agree on a measurement between 1/32 of an inch to a maximum of 3/16ths. However, I like to check the guitar’s manufacturers recommendations for the specific guitar I am working on and go with that.
I would recommend getting a full professional intonation setup on your guitar after these adjustments.
Adjusting Saddle Height On Guitars With A Floyd Rose
Guitars with a Floyd Rose require a bit different procedure: