Focusing tips for a beginner

Lack of correct focus could very well be the case, with as new a photographer as myself.

And for the record, I upgraded for decreased noise at higher ISOs, since a lot of my photography has been indoors.  I do want to use every opportunity I get to learn more about how to get various desired effects, in this case sharpness in wide angle landscape photos.

I'm definitely looking into using a tripod, as I'm interested in delving into night photography at some point.  I don't know how much effect camera shake had on these particular photos, however, as there's little opportunity for it to have an effect at 1/800.