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Kingo 1 click root app
Also installs a rootkit that continuously communicates with servers in China, sending details on everything that is on your phone and everything that you do with your phone. Also disables / modifies any other security apps on your phone.
Most oneclick solutions are disguised spyware.
Unlock the bootloader, flash TWRP, flash SuperSU. Choose a SuperSU version that is a Chainfire version if you can, as the new versions are less trusted.
Thanks.
Phones a nexus 6p.
The Kingo 1 click root app seems to get great reviews and recommended the Geeks Hacking app