Lead Tape 101

I am looking for the Cliff Notes version of the Lead Tape 101 documentary. I have always played with the stock form of my racquet. However, I see a lot of people on TT put lead tape of all different length/weight on their racquets. I would like to know what it does for the racquet to:
1. Put lead at 3 and 9?
2. Put lead at 2 and 10 (or is 1 and 11 the right location)?
3. Put lead at 12?
4. Put lead under the grip (or inside handle)?

If this topic has been discussed on another thread before, please point me to the thread. Thank you.
 
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