Canon EOS60D18135ISKIT User Manual (en)

Depending on the scene, position the subject toward the left or right to 
create a balanced background and good perspective.
In the <1> (Full Auto) mode, while you press the shutter button 
halfway to focus a still subject, the focus will be locked. You can then 
recompose the shot and press the shutter button completely to take the 
picture. This is called “focus lock”. Focus lock is also possible in other 
Basic Zone modes (except <5> Sports).
In the <1> (Full Auto) mode, if the subject moves (distance to camera 
changes) during or after you focus, AI Servo AF will take effect to focus 
the subject continuously. As long as you keep aiming the AF point on 
the subject while pressing the shutter button halfway, the focusing will 
be continuous. When you want to take the picture, press the shutter 
button completely.
1 Full Auto Techniques
Recomposing the Shot
Shooting a Moving Subject