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I am new to cryptography. During my learning I am facing a problem with S-DES. I am confused where P10 to P8 come from, and I’m confused about the processing of this algorithm. Does anyone have any good article/paper/reference which enables me to understand how to solve it easily?

I am reading following example but getting confuse..

Example:

P10 = { 3, 5, 2, 7, 4, 10, 1, 9, 8, 6}
P8 = { 6, 3, 7, 4, 8, 5, 10, 9}
K =     10100 00010
P10     10000 01100
LS-1    00001 11000  ->  P8  ->  K1 = 1010 0100
LS-2    00100 00011  ->  P8  ->  K2 = 0100 0011
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