In My Hands
I know it like the back of my hand - English phrase used to say that the subject knows the matter perfectly, as if it were part of their body, or that they were born with the knowledge. Related: Second hand.
Second hand - Similar to "I know it like the back of my hand," in that it is definitely known by the subject. Similar to something being described as second nature. Not to be confused with second-hand goods, which have already been used before, and are being resold. In the U.S., at least, second hand means indirect--almost the opposite. "She told me walking everyday is good for the brain" indicates second hand knowledge.
A person may also describe somebody as his right hand man, which means that he relies heavily on this person; this may derive from the importance of the right hand in right-handed individuals. The commonness of right-handedness may be the source of attitudes of importance and superiority on the right over the left by many cultures. This is exemplified by phrases such as "to be seated at the right hand of the gods when Judgment comes."
Lending a Hand is an English phrase that means helping someone. If I ask you to "Lend me a Hand," then I am asking you to come help me.
The hand is also an archaic unit of measurement, and is currently used as the standard unit to measure the height of horses.
The hand in watches is an indicator, usually made of a thin, light piece of metal, very variable in form, which moves over a graduated dial or scale. Watches usually have three hands showing the hours, minutes and seconds.