Basic Life Line Meanings:
Long Line: Good Health, Vitality
Short Line: It is a myth that a short life line means a short life. If the life line is short, look closer to other signs (broken, deep, faint, etc.)
Deep Line: Smooth Life
Faint Line: Low energy
Broken Line: Struggles, Losses
Chained Line: Multiple Walks (meaning that your life path is multifold)
Forked Line: Various meanings depending on fork placement on the hand. Generally forks indicate diversion or life change. Although they can also mean scattered or split energies.
Double Line: Partner with Soul Mate, or there is someone near (friend or family member) that serves as a guardian or caregiver.
Absent Line: Anxious, Nervous