Here we go~ All about the focus points within the viewfinder of your camera. When I look through my camera (I never use the digital screen to view the subject when taking photos) there are many dots in somewhat of a clock circle. For my Canon they are at 12, 1:30, 3, 4:30, 6, 7:30, 9, 10:30 and back to 12 noon. Each of these are focus points that can be manually set for each and every photo you take ~ I use this tool all the time.
Right out of the box your camera most likely was set on auto and what that means is your camera is making the best guess as to what “it” thinks you are trying to focus on in the picture, however, you are able to set this focus point manually. For my Camera a little red blinking light will light up as I gently push the shudder button showing where the main focus point is set. Using the buttons on the back of the camera I can move the red dot to any of those points and click set and that’s where the camera will focus, leaving the rest perhaps out of focus and maybe creating a great bokeh effect, depending on the photo being taken.