Quora isn't exactly a great place for reputable information.
Quora is just people opinions. Nothing is peer reviewed, nothing is fact checked, often very wild, and incorrect statements made.
Your next rooting attempt, try following guides from here on XDA, as myself I have rooted & TWRP'd , on my first attempt, same with countless thousands of others.
Besides, posting links to other sites for instructions, well... It's kinda tacky.
A faux pas, if you will.
r0mushii gave you the correct first step, and if your having trouble, the correct path is to ask for help in a TWRP thread if TWRP is not installing for you, as this thread, is rather dead, and the room most certainly will not be updated, which equals to very little traffic.
I do hope this helps you along your way, cause the world of root can be marvelous place... Just don't let these little stumbling blocks get you down. Keep moving forward...