- Auto-focus is automatic, so there isn't a way to select/test your focused subject before snapping a shot. You can turn on tap to focus, but it takes a shot right after it thinks something is in focus, so it's hit or miss. Just use the default option and move the camera around until your subject is in focus.
- It's a gesture based UI, so you swipe from left edge to bring up a radial menu, swipe from right edge to get to gallery, slide up to zoom in, and then slide down to zoom out (if zoomed in).
- I don't use video, so refer to that online manual for more specifics, or just try it out yourself.
There should be short tutorial instructions when you first get the phone and open the camera...