aperture

same frame. 2 settings
first one with a wide open aperture-f/4
second one with a small aperture-f/22
adjust shutter speeds to expose properly, and see how the first one is throwing the background out of focus. this is the approach for potrait photography.
for taking landscapes, where you want the entore picture to be sharp, take the second setting (depending on light of course).

good start would be to use "Av" aperture priority auto exposure mode to get going.

happy shooting.

this is written primarily for my friends who have done a bit of photography and are thinking on learning/improving specific things.
ramesh, vaishnav et.al.