Post some sample photos of scenarios what you try to capture. I can give some tips anyway.
1. First set ISO to 100
2. Use tap to screen for focus. Use medium bright spot from the focus level you want be on focus. Tapping too dark or bright spot may cause camera to miss focus. If above fails use manual focus.
3. Check what camera gives for shutter speed. If it stays below 1 sec you should be OK. 1.5 second shots are possible by little bit of practise. Raise ISO value if shutter speed is too slow.
4. Now hold phone as steady as possible. Same time keep on eye focus rectangle. When it is completely still press shutter from your screen. Do not use physical shutter button since it causes phone to move and blurred photo.
It is very important when you press shutter button. When you first tap to focus it takes 2-3 sec for image to stabilize. You can see that from rectangle easier by concentrating to it. When image is completely still this is your moment to press shutter. If you wait too long image starts move again until it stabilizes again. I can take blur free photos every time if i follow this procedure up to 1.5 seconds.
5. View photo you just took and pick up your jaw from floor.
6. Keep practising and you will nail it every time.
Making scene brighter than reality helps to hide some of noise if you are forced to use higher than 400 ISO values.