It really isn’t that complicated. Look down. How far are you above the ground? 
By “your elevation above ground level”, I mean simply that. If your house is on the ground, then your elevation is zero. If it’s on 20 meter stilts, then it’s elevation is 20.
Ok, so the average person is maybe 1 - 2 meters tall, so maybe you could enter 1 or 2.
There’s a whole discussion here:
For a better explanation than mine, see Effect of Elevation from the astral package’s documentation. (As mentioned above, HA, including my custom integration, uses the astral package to make these sun related calculations.)
If you’re on a hill, then yes, you’d want to include that, assuming that hill is above the average ground level in your area. It all has to do with the curvature of the Earth and how you see the horizon from where you are. Interestingly, the astral package also apparently has a way to tell it there is a mountain between you and the horizon (how far it is from you and how high it is), because that can delay sunrise, but HA doesn’t support that. Although, I might with my custom integration. Hmm…