Gyan Mudra (Mudra of knowledge):

Method:
Touch the tip of the thumb to the tip of the index finger, with the
other three fingers stretched out.
Specialty:
As it is a mudra of knowledge, it enhances the knowledge. The
tip of thumb has centers of pituitary and endocrine glands.
When we press these centers by index finger the two glands
work actively.
Time duration:
There is no particular time duration for this mudra. You can
practice by sitting, standing or lying on bed whenever and
wherever you have time.
Benefits:
Increases memory power and sharpens the brain
Enhances concentration and prevents Insomnia
If we practice it regularly, it will cure all psychological disorders
like Mental, Hysteria, Anger and Depression

Prithvi Mudra (Mudra of earth):

Method:
Tip of the ring finger touches the tip of the thumb, with the other
three fingers stretched out.
Specialty:
It reduces all physical weaknesses.
Time Duration:
It has no particular time duration. You can practice it any time
you want.
Benefits:
It helps to increase the weight for weak people
It improves the complexion of skin and makes the skin to glow
It makes the body active by keeping it healthy

Varuna Mudra (Mudra of Water):

Method:
Tip of little finger touches the tip of thumb, with the other three
fingers stretched out.
Specialty:
It balances the water content and prevents all diseases which
come due to lack of water.
Time Duration:
It has no specific time duration and one can practice it
according to their time.
Benefits:
It retains clarity in blood by balancing water content in the body
Prevents the pains of Gastroenteritis and Muscle Shrinkage

Vayu Mudra (Mudra of Air):

Method:
Keep the index finger on the base of the thumb and press with
thumb keeping the other three fingers straight.
Specialty:
It prevents all the diseases that occur due to the imbalance of
the air.
Time Duration:
The practice of this mudra for 45 minutes reduces the severity
of the disease in 12 to 24 hours. For better results practice it for
two months.
Benefits:
It cures Rheumatism, Arthritis, Gout, Parkinson's disease and
paralysis without any medicine
It is useful for Cervical Spondilytis, paralysis to face and
catching of nerve in neck
It corrects the disorder of gas in the stomach

Shunya Mudra (Mudra of Emptiness):

Method:
Keep the middle finger at the mount of Venus and press it with
thumb.
Specialty:
It reduces the dullness in our body.
Time Duration:
One can practice it for 40 to 60 minutes daily until to be cured
from the disease.
Benefits:
It relieves an earache within 4 or 5 minutes
It is useful for the deaf and mentally challenged, but not for
inborn ones.

Surya Mudra (Mudra of Sun):

Method:
Bend the ring finger and press it with thumb.
Specialty:
It sharpens the center in thyroid gland.
Time Duration:
Practice it daily twice for 5 to 15 minutes.
Benefits:
It reduces cholesterol in body and helps in reducing weight
It reduces anxiety
It corrects indigestion problems

Prana Mudra (Mudra of Life):

Method:
Bend ring finger and little finger and touch the tip of thumb with
their tips keeping the remaining two fingers stretched.
Specialty:
As it is the mudra of life, it improves the power of life. Weak
people become strong. It reduces the clamps in blood vessels.
If we practice it regularly, we will become active.
Time Duration:
No specific time duration. One can practice it any time.
Benefits:
It improves immunity
Improves the power of eyes and reduces eye related diseases
It removes the vitamin deficiency and fatigue