There are three major lines called Lifeline running from base of thumb onto wrist, Heart line running from under little finger onto base of index finger and Headline again running from base of thumb to middle edge of palm below little finger. These in turn reflect quality and extend of LONGEVITY-HEALTH (Lifeline), MENTAL POWERS (Brain line) and EMOTIONAL-Physical heart condition (Heart Line).

You also see some other line like Fateline running from above wrist onto base of second finger indicating material well-being and purposefulness in life, Sun line running from base of ring finger downwards indicating ambitions & power position in life. There are countless other lines, too many to list here.

You will find various books on this subject, one by William G Benham is considered most authentic and accurate to learn & study this Science.