Aperture priority question

there are a few ways - firstly as FlyingFly said if you have very dark and very bright areas of the same shot then getting all into a single frame is very hard - especailly with a DSLR since they have a lesser dynamic range than film can have.

There are a few tricks you can use however:
1) HDR/Tonemapped = for this you take a series of bracketed shots (there should be a part of your manual which explains how to take these) where you overexpose one shot, perfectly expose the next and then underexpose the last. The idea is that then you have a midrange shot, a shot overexposed and so showing details in the darker areas, whilst blowing out the brighter; and the underexposed shot which exposes the brighter areas best and leaves darkness in the darker areas.
Then you use software to combine the 3 images into a single photo which is then able to show all the different sections in their correct exposure.

2) ND grad filter - use one of these to selectivly darken the sky and thus allow you to expose more for the ground level and thus retain details. They come in different grades and beyond telling you to use them I can't comment as to what grade would be best - field experience will be a good learner here.
I can say that you want to get the square kind that fit into a holder rather than the circular variety since with the circular filters the point of change is at the middle of the frame - ergo one half of the photo is always filtered for darker and one is not - which is limiting if you only want say, the top 1/4 darkened - the square filters that fit into a holder allow you to move the filter up and down and thus pick the point of change
 

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