its basically the processor of the ps3, so in other words to find/create mods/functions in for example call of duty you will need to know powerpc to be able to make cool function etcs

What do I need to learn to understand powerpc?

PowerPC is a langauge its self (assembly langauge) here's some resources to learn from:

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[url=ttps://www.mediafire.com]Bitwise eBook[/url]

note:
you must know some C/C++ for this to be alot easier to learn but i suppose you could know C# aswell but C/C++ would be a better choice.

Thank