Personally, I have never used post focus my camera. However, I came across this video from Panasonic explaining how post focus works!
It is just 2 minutes long (approx) and the gem in this video is at the end, when the man from Panasonic explains how you can use post-focus for exploiting the technique of focus stacking, Nice!
I will be trying out the focus stacking technique as my editing software On1 Photo RAW 2019 has this function.
You can get a 30 day trial here: ON1 Photo RAW 2019
Happy post focus shooting 🙂