Using the histogram in liveview mode adjust the exposure so that the light from the moon is centered in the histogram. Assuming it is the subject that would be normal exposure ... normal exposure is not a requirement since photography is an art form.
It may be helpful to zoom and or point the camera so that other foreground elements are not visible in the frame to isolate which parts of the histogram are the moon. Feel free to get the exposure for the moon from a different spot than the photo will be taken to have confidence of what part of the histogram is the moon ... the exposure will not change.
After getting the exposure for the moon frame the foreground elements. Note their exposure by how they effect the histogram. The postcard ideal is the photo is being taken in the twilight hour and these elements are at the same exposure.
For twilight or magic hour photos arrive early because natural light hitting the foreground elements will be changing; If you are early you can wait for them to intersect with how much you want them exposed.
For the twilight hour where the landscape is exposed by the sunset matching the full moon moonrise, you want to plan to take the photo the day before the real full moon. However, that exposure is a choose not a rule.
If the foreground elements are not at the same exposure:
- Sometimes a flash or light painting can be used to add light to foreground elements that are nearby.
- Two photos can be taken and blended in photoshop or an HDR can be made with three or more exposures.
- It does not matter if the foreground elements are completely exposed. Vincent Van Gogh starry night painting does not have foreground elements completely exposed ... photography is an art form.