Here are some key features:

Status

– Check Magisk Version and updates
– Check root status
– And Check SafetyNet

Install

– Select boot image location
– Advanced installation settings

Superuser

– Manage Superuser permissions
– Toggle logging and notifications for each individual application

Modules

– Enable/disable, remove Magisk Module
– Manually add Magisk modules by selecting Magisk Module zip files

Downloads
– Download Magisk Modules hosted on the Magisk Repo

Magisk Hide
– Select the app you want to hide Magisk from
Settings
– Toggle systemless host support
– Toggle Busybox support
– And toggle Magisk Hide
– Tons of Superuser settings
… and much more to come!

Installation Instructions

If you already have Magisk installed, it is strongly recommended to upgrade directly via Magisk Manager
Instructions for installing the first time are presented below:

– If you plan to flash a custom kernel, flash it AFTER installing Magisk

–Make sure to remove any other root, your best bet would be restoring your boot image back to stock Via custom recovery

-Download the latest Magisk zip file

-Reboot to a custom recovery and flash the flashable zip

-Reboot to system, and check whether Magisk Manager is installed and the version matches the latest one in the OP

Via Magisk Manager (Only support v14.0+):

-This method does not need root, and also does not require a custom recovery.

-However, you MUST have a stock boot image dump beforehand, and you also have to be able to flash the patched boot image, either through fastboot/download mode or ODIN
Install the latest Magisk Manage