Rooting the HTC One M7 - The easiest and quickest way of rooting this device?

As the title of the thread goes, can anyone tell me what's the easiest and fastest procedure to root this device. I am not very much of a root-geek and therefore do not possess much knowledge in this rooting platform however I have rooted one of my previous phones Samsung Galaxy S3 and I remember it was quite easy and straight forward but then I decided to stay away from root for a couple of years but now I feel like experimenting again on my htc device. So could you please tell me how to root this phone. I have an unlocked htc device so any root procedure that explains in detail how to perform root and also if wanting to go back to stock rom how is that performed.

Thank you.