Shsandro wrote:
at what % should i start charging macbook pro? and when it is 100% and plugged in, it does not uses battery, so should i leave plugged in always when i have chance?
I would not run it down to zero%
It will never over charge
If you are near the mains leave it plugged in, if you need portability then run on the battery. Following after that general rule use as you see fit.
About Mac notebook batteries
https://support.apple.com/en-us/HT204054
Batteries - Maximizing Performance - Apple
https://www.apple.com/batteries/maximizing-performance/
Determine battery cycle count for Mac notebooks
https://support.apple.com/en-us/HT201585
About battery health management in Mac notebooks— 10.15.5
https://support.apple.com/en-us/HT211094
About lithium-ion batteries
https://www.apple.com/batteries/why-lithium-ion/