Need Help-Rooting and Unlocking Bootloader of Lenovo K4 Note Marshmallow-A7010a48

Hey guys i've found a tutorial on youtube to unlock the bootloader of k4 note and rooting it for android marshmallow 6.0. I think this is the only tutorial on net to showing how to unlock the bootloader of k4 note marshmallow.
here the link (as i cannot post links, so copy and paste links in your browser)-

[Marshmallow] Install Custom/TWRP recovery on Lenovo K4 note/A7010a48 (http://youtube.com/watch?v=mm7SWNpoFzo)

http://youtube.com/watch?v=LQ1xe06c26k -This is the Rooting video

so guys i want to know that,

• after unlocking bootloader can i do OTA updates? can i get notifications for OTA updates as i am getting before?
• what happens with the lenovo stock recovery?
• can i use flashfire on my phone? and can i install CM 11 on my phone?
• when i install any other rom on my phone then can i do OTA updates and if i revert back to stock rom then what happens with the custom recovery?
• does custom recovery can do OTA updates? like, after flashing custom roms can i get notifications of new software update, and can i update them from settings>about>software update. (can i do OTA updates when i am running custom rom in my phone?)
• can i get back to lollipop using flashfire?

sorry but in all those cases i am a noob(not fully), but i really need the answers.
and i really need you guys to look in that tutorials, are they safe?

as i am new there, so mods if this is not the right place for this thread so please move it to the right place.
and i hope answers of this questions wll help others new users too.

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