[Q] xperia ZR rooting

Hello Experts,
I'm fairly new to this world.. Hope you guys will help me out..

My Questions are,

-What is Custom ROM & Stock ROM with regard to Rooting?
-How to root Xperia ZR?
-What is flashing the drive?
-When I type *#*#7378423#*#*, it says in software info section-- you phone doesn't support firmware version read.
Also in configuration section, Rooting status: Bootloader unlock allowed: YES
-What is locked boot loader and unloacked boot loader?

All I want is to install 4.4.2 or 4.4.3 on ZR.

Eagerly waiting to get some guidelines/ tutorials.
Thanks & Regards,

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