A proper exposed photo will hug the entire graph.
If it leans more to the right, it means it's over exposed.
It also depends on what you are shooting.
Learn to use Lightroom. It will give you an idea of clipping the highlights, etc
See some videos on editing in lightroom.
But basic is if it leans to left means underexposed or you are shooting a dark subject in a dark environment kinda thing.
If it's extreme right that over exposed or you are shooting something white etc.
You want the spikes somewhere in The middle of the graph for a well balanced photo.
Again depending what you are shooting or the style you want like a silhouette etc.
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