I've been checking out hands for over 40 yrs, takes a lot of practice. Not just about the lines, also about shapes of fingers, nails,etc..

Some examples that I find accurate: a flexible hand reflects a more flexible person. A stiff, rigid hand indicates someone very controlled.

A thick, square palmed hand with square fingers and fingertips is often the hand of a mechanic.

Most of the hands of actors have low-set large thumbs, as do many politicians..indicates someone good at relating to all sorts of people..

Very pointed fingertips indicate psychic sensing.

Best to compare many books and hands to get a true feel for Palmistry. Fun hobby.