now it is not that easy to root mobile phone.
3- 6 years ago I rooted every phone I own. now, I do not even bother to do so. I guess I'm getting old, brothers!

Yeah. I remember.. It was way simpler with my Samsung Galaxy S3 back in the day. Right now chances are you're going to trip the Nox thing and you wouldn't be able to use some features/apps like Samsung Pay and such. I'm sticking with unrooted for now. Probably for security sake also.
by the way, installed Authy and made backup of codes, the app seems nice and easy to use.
Glad it worked out well!