Newbie Question Thread

[sailwhist]

Hello. I reviewed literally everything on this forum which is considered as a "guide", and I still can't understand what I should do and how should I apply all that compression methods and scripts on different kind of files (audio, movies etc.) and moreover how should I determine what is what and which files should I compress with which method?
I reviewed best compression methods index for the game I wanted to compress (gta4) and I have no clue what should I do with that information:
gta iv complete edition 12.9GB
audio file srep+lolz...
you can use msc but i didn't see improve ratio...
movie bkp...
rest of the file zlib:max:c32m+srep:m3f:a2+lolz...
I downloaded DiskSpanGUI and all I understood for now is how to select the input game folder. How should I learn about game compression if there is no comprehensible clear guide for begginers, only some general info like "use XTool and compress your games", but not a single example about how to apply all that scary configs and scripts for a certain files.
Please, if I missed something on this forum what potentially could've helped me - point me on that.