NetHunter Rootless : The core of NetHunter for unrooted, unmodified devices.
NetHunter Lite : The full NetHunter package for rooted phones without a custom kernel.
NetHunter : The full NetHunter package with custom kernel for supported devices.

Official release NetHunter images for your specific supported device can be download from the Offensive Security NetHunter project page located at the following URL:
Download
Once the zip file has downloaded, verify the SHA256 sum of the NetHunter zip image against the values on the Offensive Security NetHunter download page. If the SHA256 sums do not match, do not attempt to continue with the installation procedure.You may also enable zip signature verification before flashing and TWRP will verify the entire zip for you before installing.

Those of you who want to build a NetHunter image from our Gitlab repository may do so using our Python build scripts. Check out our Building NetHunter page for more information. You can find additional instructions on using the NetHunter installer builder or adding your own device in the READMElocated in the nethunter-installer git directory.

Open the NetHunter App and start the Kali Chroot Manager.
Install the Hacker Keyboard from the NetHunter Store using the NetHunter Store app.
Install any other apps from the NetHunter Store as required.
Configure Kali Services, such as SSH.
Set up custom commands.
Initialize the Exploit Database.

All apps can be installed through the NetHunter Store client.
The NetHunter Store App can be downloaded here
The NetHunter Web Store can be found here
The source code for building the NetHunter Apps can be found on GitLab here