I don't think your shots look too bad really. If you are shooting in Av mode on the big dial on top, it means that you control the aperture, and the camera's light meter will let the camera decide what shutter speed (accounting for the ISO/sensitivty you have chosen) is needed to get a good exposure. Av mode is probably the most commonly used mode as the aperture is the main thing that gives you artistic control over a picture. Shoot in Av mode to start with and help you understand the purpose of the aperture. For shots like the ones you have taken, usesomething like f/11 or f/16 - the higher the number the bigger your depth of field, which means that most of the foreground and the background should be in focus. For landscape shots you will also want to google 'hyperfocal distance' which isn't as complicated as it sounds - it is basically just where you should focus on in a landscape shot to ensure that all the foreground and background are in focus.