Interestig article to read, and here is What Grip means to me and Why I grab others' hand.

1. In my daily medical practice;

I let my patiens to grab my two fingers, 2nd & 3rd, of both hands to see their grabbing
power. It's a simple physical exam, but I can determine CNS focal sign and other causes
when you put together their History & Physical.

2. At the golf course;

a) Shaking hands is my way of saying Hello to my friends when I meet them at the golf
course before we start the round, but it's a good way to Find out whether they practiced
a lot, or not. Strong-grip feeling means "Watch out this guy", especially when you are
going to Bet something (money, or drink, or dinner) for the day.

b) Technically in my golf, I prefer "Neutral Grip" than "Strong, or Weak Grip".
You know what those Grip methods mean - which I don't need to explain.

3) In daily life;

I like to shake hands, Men or Women, before they reach out their hands.
Believe or not, through the tramission of their body temperature to my hand,
I Can See Through Their Inner Side.
You need Practice & Experience for the interpretation I mentioned.