I’m recently switched to Linux mint mate edition i didn’t noticed to create a separate partition for my os Now it’s use my devices full space so how to split it storage like one is for personal and the another one is for system usage
Please give me the answer 
press ctrl+alt+t the terminal will open then type this command
sudo apt install gparted -y
It start install gparted. After installation
Go to menu(bottom - corner window icon) → search gparted and open
Then next step
open gparted ( Go to menu(bottom - corner window icon) → search gparted and open) and sent screenshot.
