Good advice from OldBoy as well.
Another alternative to start with if you are not sure about F-Numbers, shutter speeds etc is to let the camera deal with it but don't shoot in Auto if possible choose the appropriate scene mode i.e. landscape, portrait, night time etc that way you are helping the camera decide on what settings to use for example portrait it would choose a shallow depth of field, where as with landscape it would shoot at a higher aperture so it is sharp front to back. You will need to keep an eye of the shutter speed especially in landscape and night mode though as it may be necessary to put the camera on a stable surface or if possible a tripod if it has gone for a slow shutter speed.
If you want to get familiar with the settings then a way to play and learn is to try
this.