Sony is known for having bad menus that can confuse people new to their system so DPRTV released a tutorial for setting up Sony’s best feature, Real Time Autofocus. You can read a sumary of the above video below:
If this is the first time you have used a camera then you might want to say in full auto mode
Real time AF is avalible in full auto mode
You push the FN button when you turn on the camera
Then go to focus mode and make sure it says AF-C
Exit and hit the the FN button again
Then go to focus area and choose the very bottom option tracking wide
This will let the camera decided what to focus on for you
If it detects a face it will lock onto it all on its own for you
Even if you have the camera setup like this you can touch on the screen to choose a new focus point
If you leave full auto mode then there are more options
The focus area now has options like tracking zone where you can limit the AF to a portion of the frame
The spot focus is more useful if you want to restrict AF and once it locks on you can move the camera around