backing up what was said above:
priority modes - these are "modes" on your camera where you control aperture or shutter speed and the camera handles the other one for you. this is easier than manual where you control both.
aperture (f-stops) - this controls how much light the lens lets in - smaller number is more light and a shallow depth of field (not much in focus), higher number is less light and more in focus
---note that is you increase the f-stop you are going to gain focus, however let in less light which means your shutter (exposes sensor) needs to stay open longer.
shutter speed - controls how long the sensor which records the image is exposed to the light your lens lets through. faster shutter speeds capture moving things with little to no blur - slower will blurr (sensor sees all the movement)
so as you increase your f-stop to gain depth of field your shutter time will also increase making you more prone t blurring. this is the reason you should use a tri-pod and a timed setting (2/5/10 second delay to take picture), or a remote trigger. the camera is so sensitive that your hand pressing on the shutter button can blur the image.
ISO controls the sensitivity of the sensor - you can reduce your shutter speed by increasing the sensitivity (ISO) - however it comes at the price of loosing color brightness and grainy images.
try the following settings:
tripod
set timer to take picture to 10 seconds
aperture priority mode
F11
ISO 100
the camera will control the shutter speed for you (again - aperture priority puts you in charge of aperture and lets the camera control the shutter speed).
good example of f-stop impact on depth of field:
https://www.reef2reef.com/forums/photography-forum/53956-depth-field-pictures.html