How do I update using TWRP?

[GLDYY]

The title explains itself, Do I have to format any partition? and do I preserve my root after updating?
EDIT: I'm trying to do it using TWRP because the updater gives an MD5 Checksum error

 

[ingbrzy]

MD5 Checksum error =corrupted zip file..download ROM again and install in TWRP - install - select zip - done

 

[GLDYY]

MD5 Checksum error =corrupted zip file..download ROM again and install in TWRP - install - select zip - done

So no data loss? thanks

 

[ingbrzy]

of course not...