The focal length of Nikon d80 18- 135 is 70. What focal length should I use to shoot the scenery? What should people and scenery do?

In fact, whether the focal length or aperture is for shooting, don't stick to a fixed routine.

To shoot scenery, wide angle is suitable for shooting big scenes, medium focus is suitable for shooting small scenes, and telephoto is suitable for shooting close and distant scenery.

You can get exaggerated deformation effect when shooting people in wide angle, while the middle focus is a good portrait focal segment, and the telephoto can get better background blur effect when shooting outdoors.

As for balance, I understand what you mean by taking pictures of people in the environment, not only taking pictures of people, but also preserving the scenery of the environment. It's better to shoot the scenery and arrange people in the right place.

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Generally speaking, except when the background blur effect is needed to shoot portraits, properly narrowing the aperture in other shooting occasions can make the depth of field larger and obtain a clear picture effect from far to near.

As for the focal length, it can only be said that it is more likely to use a wide angle for landscape shooting and a medium telephoto for portrait shooting. But there are no certain rules.