Premise: The root is a relatively risky operation.
Premise 2: It will not be possible to apply the updates O(n)T(he)A(ir) that the phone manufacturer could release in the future
Premise 3: You MUST have installed TWRP. You can find the tutorial HOW TO INSTALL TWRP here
Open the browser from the phone and go here:
Tap and download the stable version of Magisk Manager:
https://github.com/topjohnwu/Magisk/...ger-v6.1.0.apk or from the MagiskManager-v6.1.0.apk
Probably, on the phone screen, will appear a screen that tell you that the application is not secure and you'll have to tell him to enable the installation from that source (you'll have to do a couple of extra tap)
Now, on the phone you will have installed the Magisk Manager application, start it!
1) From the main screen of Magisk Manager, Tap on 'Install'
You will see 'Installation of Magisk, do you want to install Magisk-V...zip?
2) Tap on 'Install'
3) You will be asked to select the method you want to install it with, Tap on: Direct Install (Recommended)
4) It will appear a screen with a series of writings, at last you'll read: All Done!
5) Tap on REBOOT.
Congratulations you have performed correctly the root!
Now that you have root, maybe you are interested to have Google Camera Mod for do better shots! You can find the tutorial HERE