[AC Question]

Hi,
i am farily new to rooting my devices so I apologize in advance for the lame questions. Of course, i tried to find informations by my own but you often can get informations telling ont thing and its contrary.

I want to root my Note3 and it seems pretty easy usint towelroot but the android version i got installed was published in July 2014.
Can i still use the hack ?
If no, if i reset the devise could i then use the hack ?
Once i got root that way, do i have root "only" for that system or does it mean i can also install custom ROMs ?

Thanks for any help